Rockwell Automation 2708-DH5B2L, 2708-DH5B4L User Manual
Attended Workstations
(Catalog Nos. 2708-DH5B2L & -DH5B4L)
(Series B)
User Manual
ALLEN-BRADLEY
Disclaimer
Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. “Application Considerations for Solid State
Controls” (Publication SGI-1.1) describes some important differences
between solid state equipment and hard–wired electromechanical devices.
Because of this difference, and also because of the wide variety of uses for
solid state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is
acceptable.
In no event will the Allen-Bradley Company be responsible or liable for
indirect or consequential damages resulting from the use or application of
this equipment.
The examples and diagrams in this manual are included solely for illustrative
purposes. Because of the many variables and requirements associated with
any particular installation, the Allen-Bradley Company cannot assume
responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Allen-Bradley Company with respect to use
of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without
written permission of the Allen-Bradley Company is prohibited.
Table of Contents
Attended Workstations
User Manual
Introduction
Installing a Network
Chapter Objectives 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Catalog Numbers 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Items 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Publications 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Information 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simple Network 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The RS-485 Network Bus 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Network Connector (Catalog No. 2708-NNC) 2–3. . . . . . . . . . . . .
Cabling a Network Using the Network Connector 2–4. . . . . . . . . . . . .
Cable Wire 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing the Wire 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Connector 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Connection 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NON-MASTER Connection 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Step By Step Installation 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Terminator Switch 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Cables 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing the Network for Data Transmission 2–10. . . . . . . . . . . . . . . . . . . . .
Communication to the Host Computer 2–11. . . . . . . . . . . . . . . . . . . . . . . . .
Description of Large or Complex Network 2–13. . . . . . . . . . . . . . . . . . . . . .
Complex Network 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alternate Communication Links 2–14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Networks Over Telecommunications Lines 2–15. . . . . . . . . . . . . . . . . . .
Barcode Connection
Status Displays
Chapter Objectives 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connection 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary Status Display (Status Display 0) 4–2. . . . . . . . . . . . . . . . . . . . .
Network Status (Status Display 1) 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reserved Status (Status Display 2) 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time Status (Status Display 3) 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Reset Status (Status Display 4) 4–5. . . . . . . . . . . . . . . . . . . . . . . . .
A – Error Codes 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Queue Status (Status Display 5) 4–6. . . . . . . . . . . . . . . . . . . . . . .
Workstation Memory Status (Status Display 6) 4–8. . . . . . . . . . . . . . . . . .
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User Manual
Program Load Status (Status Display 7) 4–9. . . . . . . . . . . . . . . . . . . . . . . .
Program Run Status (Status Display 8) 4–10. . . . . . . . . . . . . . . . . . . . . . . . .
Application Status (Status Display 9) 4–11. . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Menus
Introduction 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Menus via Workstation Keypad 5–1. . . . . . . . . . . . . . . . . . . . . . . . .
Sub-Menus 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exiting Network Menu 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Menus from
the Comm Port 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 1: Network Menu Paramters 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Workstation 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Workstation Type 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 2: Comm Port Menu Parameters 5–5. . . . . . . . . . . . . . . . . . . . . . . . .
Comm Port Mode 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comm Baud Rate 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comm Data Bits 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comm Parity 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 3: System Menu Parameters 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 4: Bar Code Menu Parameters 5–8. . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 5: Read Only Menu 5–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menu 6: Diagnostics Menu Parameters 5–10. . . . . . . . . . . . . . . . . . . . . . . . .
1–Keypad/Laser Test 5–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–Display Test 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–Destructive RAM Test 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–Continuous RAM Test 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–Comm Transmit Test 5–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–Comm Receive Test 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–Comm Loop Test 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–Aux Comm Transmit Test 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9–Aux Comm Receive Test 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–Aux Comm Loopback Test 5–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–RS485 Block Receive 5–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C–RS485 Block Transmit 5–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D–RS232 Block Receive 5–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E–RS232 Block Transmit 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F–Lamp Test 5–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G–Reset Powerup 5–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H–Reset Unit to Factory Defaults 5–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents
Attended Workstations
User Manual
Operating Procedures
Network Design
Host Communications
Chapter Objectives 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Proper Network Operation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Master 6–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instituting a New Workstation as Master 6–4. . . . . . . . . . . . . . . . . . . . . . . .
Removing a Workstation from the Network 6–4. . . . . . . . . . . . . . . . . . . . .
Adding a Workstation to the Network 6–5. . . . . . . . . . . . . . . . . . . . . . . . . .
Network Problems 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Workstation Status 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Networks of 32 Workstations or Less 7–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Network Installation of More than 32 Workstations 7–1. . . . . . . . . . . . . . .
Fault-Tolerant Networks 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extending Networks Over Phone Lines 7–4. . . . . . . . . . . . . . . . . . . . . . . .
Network Status Records 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Retry Counts for Network Diagnosis 8–3. . . . . . . . . . . . . . . . . . . . .
Responses to Network Directives 8–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Directives 8–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
< D – Show Unit Display 8–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
< E – Show Last Error Message 8–5. . . . . . . . . . . . . . . . . . . . . . . .
< R – Show Last Reset Message 8–5. . . . . . . . . . . . . . . . . . . . . . .
< S – Show Unit Serial Number 8–6. . . . . . . . . . . . . . . . . . . . . . . .
< T – Show Workstation Date & Time 8–6. . . . . . . . . . . . . . . . . . .
< V – Show Firmware Version 8–6. . . . . . . . . . . . . . . . . . . . . . . . .
> > A – Abort Currently Running A-B VBASIC Program 8–7. . .
> > G – Restart an Aborted BASIC Program 8–7. . . . . . . . . . . . . .
> A – Abort Test 8–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> C – Send Text Out Comm Port 8–7. . . . . . . . . . . . . . . . . . . . . . .
> c – Send Text Out Aux Comm Port 8–7. . . . . . . . . . . . . . . . . . . .
> D – Display Text on Front Panel 8–7. . . . . . . . . . . . . . . . . . . . . .
> E – Erase the Menu Password 8–8. . . . . . . . . . . . . . . . . . . . . . . .
> F – Reset to Factory Defaults 8–8. . . . . . . . . . . . . . . . . . . . . . . .
> N – Initialize Network 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> R – Reboot Unit 8–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> T – Set Time 8–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> Z – Zero Reset Error 8–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What is BASIC
Introduction 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What is Visual BASIC ? 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What is A-B VBASIC? 9–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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User Manual
Developing and Running
An A-B BASIC Program
Step #1 – Planning 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The A-B VBASIC Development Procedure 10–1. . . . . . . . . . . . . . . . . . . . .
Step #2 – Coding with the Workstation Application Generator Software . . . .
10–1
Step #3 (Alternate) – Coding with Visual BASIC Editor 10–1. . . . . . . . . . .
Step #4 – Simulation Using Application Library 10–1. . . . . . . . . . . . . . . . .
Step #5 – Compiling the A-B VBASIC Program 10–2. . . . . . . . . . . . . . . . .
Step #6 – Downloading 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading and Auto-Starting an A-B VBASIC Program 10–3. . . . . . . . . . . . .
Start-up Condition of an A-B VBASIC Program 10–3. . . . . . . . . . . . . . . . .
LCD: 10–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Random numbers: 10–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RAM files: 10–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Variables: 10–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Host device: 10–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Termination of an A-B VBASIC Program 10–4. . . . . . . . . . . . . . . . . . . . . .
A-B VBASIC Run-Time Errors 10–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Format of a BASIC Error Message 10–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Failure 10–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The A-B VBASIC
Cross-Compiler
Special Devices in
A-B VBASIC
iv
Overview 11–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Invoking the Compiler 11–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LXB param 1 (,param2) (,param3) (,param4) 11–2. . . . . . . . . . . . .
LXB 11–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LXB Prog1 11–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LXB Prog1,Prog1,Prog1 11–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LXB Prog1,Download,PRN 11–3. . . . . . . . . . . . . . . . . . . . . . . . . . .
LXB Prog1,Startnow,Prog1,Wait 11–3. . . . . . . . . . . . . . . . . . . . . . .
A – Source File Specification 11–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B – Downloaded Executable File 11–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C – Listing File 11–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D – Secondary Download File 11–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 12–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: LCD Display 12–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: Keypad 12–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: Barcode Scanners 12–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When reading barcodes: 12–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: Host Computer 12–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Attended Workstations
User Manual
General restrictions and warnings: 12–7. . . . . . . . . . . . . . . . . . . . . .
Details of Specific Statements and Functions 12–8. . . . . . . . . . . . . . . . . . . .
OPEN “HOST” 12–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLOSE “HOST” 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WRITE # 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PUT to HOST 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PUT to NET 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PUT to QUE 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRINT # 12–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LINE INPUT # for HOST and NET
GET # for HOST and NET (OPEN with RANDOM) 12–10. . . .
LINE INPUT # for QUE
GET # for QUE (OPEN with RANDOM enforced) 12–10. . . . .
EOF for HOST and NET 12–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOC for HOST and NET 12–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOF for HOST 12–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOF for NET 12–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IOCTL$ (intrinsic function) for HOST and NET 12–11. . . . . . . . . .
IOCTL (statement) for HOST 12–11. . . . . . . . . . . . . . . . . . . . . . . . .
Devices: Communication Ports, Primary and Auxiliary 12–11. . . . . . . . . . . .
A – Output to a Communication Port 12–12. . . . . . . . . . . . . . . . . . . . . . . . . .
B – Input from a Communication Port 12–12. . . . . . . . . . . . . . . . . . . . . . . . .
C – Modem Control Lines 12–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: RAM Files 12–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description: 12–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
File Memory Management 12–14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: Beeper 12–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: Front Panel LED’s12–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: The #9 User Status Display 12–15. . . . . . . . . . . . . . . . . . . . . . . . . . .
Description: 12–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device: The Egg Timer 12–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description: 12–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-B VBASIC Application
Library
Introduction 13–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Library 13–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Writing Programs 13–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the ENVPC Simulator 13–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A – Predefined Constants 13–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B – Global Variables 13–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C – BASIC Language Development Kit Limitations 13–7. . . . . . . . . . . .
D – PC Simulation Constants and Variables 13–7. . . . . . . . . . . . . . . . . .
Display and Keyboard 13–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network I/O 13–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
Table of Contents
Attended Workstations
User Manual
COM and AUX 13–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Display 13–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printing Reports and Forms 13–9. . . . . . . . . . . . . . . . . . . . . . . . . . .
2708-DH5B2L and -DH5B4L
Workstation Specifications
Menu Trigger Keys
Technical Description
Workstation Communication
Pin-Out Diagrams
Distance Limitations
Site Parameter List
Electrical – 2708-NP1 A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical – 2708-NP2 A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical – 2708-DH5B2L and -DH5B4L A–1. . . . . . . . . . . . . . . . . . . .
Communication Ports A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network (RS-485) Cable Length E–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232 (MASTER or HOST) Cable Length E–1. . . . . . . . . . . . . . . . . . . . .
F–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Pin-Out Diagrams
for DB9 Connector
Error Messages and Prompts
Time Display Formats
VBASIC Language
Development Kit
Programming Conventions
and Tips
vi
G–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Conventions J–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Tips J–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Attended Workstations
User Manual
A-B VBASIC and
Visual BASIC Tips
Differences Between
A-B VBASIC and
Visual BASIC
Misspellings K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strings in TYPEs K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Variables Beginning with “FN” K–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accidental Omission of %, &, ! # OR $ K–1. . . . . . . . . . . . . . . . . . . . . . . .
Use of Colons as Statement Separators K–1. . . . . . . . . . . . . . . . . . . . . . . . .
CONSTant Declarations K–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRINT “text”; : <statement> K–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Restrictions L–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supported A-B VBASIC Keywords L–1. . . . . . . . . . . . . . . . . . . . . . . . . . .
ABS(numeric–expression) L–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ASC(string–expression) L–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BEEP L–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CDBL(numeric–expression) L–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHAIN filespec L–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHR$(code) L–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CINT(numeric–expression) L–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLNG(numeric–expression) L–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLOSE [ [#]filenumber[,[#]filenumber]...] L–3. . . . . . . . . . . . . . . . . . .
CLS [{ 0 | 1 | 2 }] L–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONST constname=expression L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
CSNG(numeric–expression) L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CSRLIN L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CVI, CVS, CVL, (CVD) L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DATE$ L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DATE$ = ”yymmddw” L–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECLARE {FUNCTION | SUB} name(parameters) L–5. . . . . . . . . . .
DEFINT letterrange[,letterrange]... L–5. . . . . . . . . . . . . . . . . . . . . . . . .
DEFSNG letterrange[,letterrange]... L–5. . . . . . . . . . . . . . . . . . . . . . . . .
(DEFDBL letterrange[,letterrange]...) No longer supported L–5. . . . . .
DEFLNG letterrange[,letterrange]... L–5. . . . . . . . . . . . . . . . . . . . . . . .
DEFSTR letterrange[,letterrange]... L–5. . . . . . . . . . . . . . . . . . . . . . . . .
DIM [SHARED] variable[(subscripts)][AS type]... L–6. . . . . . . . . . . . .
DO...LOOP [{WHILE/UNTIL} booleanexpression] L–6. . . . . . . . . . .
END [{FUNCTION/IF/SELECT/SUB/TYPE}] L–6. . . . . . . . . . . . . . .
EOF(filenumber) L–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIX(x) L–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FOR counter = start TO end [STEP increment]
...
NEXT [counter] L–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
Table of Contents
Attended Workstations
User Manual
viii
FRE(numeric expression) L–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FREEFILE L–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUNCTION name[(parameterlist)][STATIC] L–8. . . . . . . . . . . . . . . . .
GET [#]filenumber[,[recordnumber][,variable]] L–8. . . . . . . . . . . . . . .
GOSUB {linelabel | linenumber}....RETURN L–9. . . . . . . . . . . . . . . . .
GOTO {linelabel/linenumber} L–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEX$(expression) L–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IF...THEN...ELSE L–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INKEY$ L–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INPUT$(bytecount[,[#]filenumber]) L–10. . . . . . . . . . . . . . . . . . . . . . . .
INSTR([start,]stringexpression1,stringexpression2) L–10. . . . . . . . . . . .
INT(numeric–expression) L–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IOCTL$([#]filenumber) L–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IOCTL[#]filenumber,string L–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
KILL “filespec” L–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LBOUND(array[,dimension]) L–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCASE$(stringexpression) L–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEFT$(stringexpression, n) L–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEN(stringexpression) L–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEN(variable) L–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LINE INPUT[;][“promptstring”;]stringvariable L–12. . . . . . . . . . . . . . .
LINE INPUT #filenumber,stringvariable L–12. . . . . . . . . . . . . . . . . . . . .
LOC(filenumber) L–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOCATE[row][,[column][,[cursor]]] L–13. . . . . . . . . . . . . . . . . . . . . . . .
LOF(filenumber) L–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LTRIM$(stringexpression) L–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MID$(stringexpression, start[, length]) L–13. . . . . . . . . . . . . . . . . . . . . .
MKD$, MKI$, MKL$, MKS$ L–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OCT$(numeric–expression) L–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ON expression GOSUB {line–number–list/line–label–list} L–14. . . . . .
ON expression GOTO {line–number–list/line–label–list} L–14. . . . . . .
OPEN file [FOR mode1][ACCESS] AS[#]filenum [LEN=reclen] L–14.
POS(0) L–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRINT [expressionlist][{,|;}] L–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRINT #filenumber,[USING stringexpression;] expressionlist[{,|;}] L–15
PRINT USING formatstring; expressionlist[{,|;}] L–15. . . . . . . . . . . . . .
PUT [#]filenumber[,[recordnumber][,variable]] L–15. . . . . . . . . . . . . . .
RANDOMIZE expression L–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REM remark
‘ remark L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RETURN L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RIGHT$(stringexpression, n) L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RND L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RTRIM$(stringexpression) L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Attended Workstations
User Manual
SEEK(filenumber) L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SEEK [#]filenumber,position L–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SELECT CASE text_expression L–17. . . . . . . . . . . . . . . . . . . . . . . . . . .
SGN(numeric–expression) L–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SHARED variable [AS type] [,variable [AS type]]... L–17. . . . . . . . . . .
SLEEP seconds L–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SOUND frequency,duration L–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPACE$(n) L–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STATIC variablelist L–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STOP L–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STR$(numeric–expression) L–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STRING$(m,n) L–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STRING$(m,stringexpression) L–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SUB globalname[(parameterlist)][STATIC]
...
...
Application Library
Subroutines
A-B VBASIC Limits
END SUB L–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SWAP vari1,vari2 L–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYSTEM L–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TIME$ L–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TIME$ = stringexpression L–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TIMER L–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TYPE usertype L–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
END TYPE L–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UBOUND(array[,dimension]) L–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UCASE$(stringexpression) L–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VAL(stringexpression) L–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WHILE condition L–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WEND L–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WRITE #filenumber [,expressionlist] L–21. . . . . . . . . . . . . . . . . . . . . . .
In ENV.BAS and ENVPC.BAS M–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In READ.BAS M–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In MENU.BAS M–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In TRIG.BAS M–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In HYP.BAS M–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ix
Chapter
Chapter Objectives
A–B
1
Introduction
Allen-Bradley workstations are designed to be rugged and very reliable when
installed using the correct voltage and network cabling. An inexpensive
network connector (Catalog No. 2708-NNC) has been designed in order to
simplify the network installation. Although the workstations may be securely
installed without this connector, it is highly recommended that this connector
be used. The time saved and the ease of installation will be significant.
Chapters 2 through 4 describe network installation, host communication, and
the connection of barcode scanners.
Installation of a network includes cabling (both power and network) and
configuration of the workstations. In some instances, it may be necessary to
consult Chapters 5 through 8 for detailed information on the proper ways to
configure the workstations.
Catalog Numbers
Accessory Items
Item Catalog No. Description
DH5 Power Supply, U.S. 2708-NP1 Accepts 120V AC input power.
DH5 Power Supply, Europe 2708-NP2 Accepts 240V AC input power.
DH5 Network Connector 2708-NNC
Application Generator Software 2708-NAG
Network Manager Software 2708-NNM
Basic Language Development Kit
Software
Hand-Held Scanner 2755-G3, -G6 Visible laser diode, moving beam, hand-held scanner for bar codes.
Bar Code Wand 2755-W1 Visible red light source (high density bar codes).
Bar Code Wand 2755-W2 Visible red light source (low density bar codes).
Bar Code Wand 2755-W5 Infrared light source (high density bar codes).
Slot Scanner 2755-B1, -B2 Slot scanner for bar codes.
The catalog numbers covered by this manual include Attended Workstations
2708-DH5B2L and 2708-DH5B4L.
Accessory items for the 2708-DH5B2L and -DH5B4L workstations are listed
below:
Communications port connector that may be wired for point-to-point or
multidrop applications.
Menu-driven development software package for custom application
programming. Includes Catalog Nos. 2708–NNM and –NBD.
Terminal emulator software utilities package that allows the workstation to
be configured for a variety of network configurations.
2708-NBD
Contains a set of source files that can be used to reduce program
development time.
1–1
Chapter 1
Introduction
Related Publications
Publication No. Title Purpose of Publication
2708-801 Application Generator User’s Manual
2708-802 Network Manager User’s Manual
2708-803 Basic Language Kit User’s Manual
2708-2.3
Safety Information
A-B VBASIC vs. Visual BASICt
The following table lists the publications that are available:
Describes how to use Application Generator Software to create
custom application programs.
Describes how to use the Network Manager Software to
configure the workstation for a variety of network configurations.
Describes how to use the Basic Language Kit source files to
reduce program development time.
Describes the differences between standard Visual BASICt
and the Allen-Bradley VBASIC modified for use with the
2708-DH5B_L workstation.
Throughout this manual we use notes to make you aware of safety
considerations.
ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property
!
damage, or economic loss.
Important: Identifies information that is especially important for successful
application and understanding of the product.
1–2
Chapter
Chapter Objectives
A–B
2
Installing a Network
The physical network is based on a twisted pair cabling technique that
follows the Electronic Industrial Association (EIA) RS-485 standard. This
standard specifies the electrical characteristics of the balanced voltage digital
interface circuit. This electrical standard is similar to the more familiar
RS-422 standard. The RS-485 communication drivers are capable of
withstanding greater voltage surges and tolerating more installation errors
than standard RS-422 communications.
The RS-485 network cabling system used by the workstations is a
daisy-chain (or multidrop) architecture. Each workstation is directly
connected to its neighbor. An example of this multidrop architecture is
shown in Figure 2.1.
Figure 2.1
RS-485 Multidrop Architecture
Network Connector
(Catalog No. 2708-NNC)
RS-232 or RS-422
From Host
Master
Although the workstations in the network may be physically identical, the
network role of an individual workstation may be different from its neighbor.
The seven possible network configurations are:
Normal Standard Workstation
Master Communicates with host computer via COM1
Alternate Backup for the Master
Concentrator Connects Submaster to backbone network
Submaster Connects tributary to Concentrator
Alt Submaster Backup for Submaster
Gateway Master/Concentrator
Normal
RS-485
Normal Normal
To Other
Workstations
These configurations are described in Chapters 5 through 8 along with
workstation set-up instructions. It is necessary to understand the
configuration set-up to be able to wire the network properly.
The network check out may be entirely accomplished by using the diagnostic
tests resident in the workstations.
2–1
Chapter 2
Installing a Network
Simple Network
ALLEN-BRADLEY
Power Requirements
Each workstation must be powered with 28V of AC power. This power is
supplied by the power supply (Catalog No. 2708-NP1, -NP2) which is a
sealed AC adaptor that is plugged into a wall outlet. The power output cable
is plugged into the power connector as shown in Figure 2. A full diagram of
all the connectors is shown in Figure 2.2.
Figure 2.2
Back Plate of the Workstation
MADE IN USA
485 NETCOM1COM2
BARCODE PWR
In a normal installation, each individual workstation is powered by its own
power supply.
The RS-485 Network Bus
It is highly important to recognize that the network should be wired to appear
as a continuous cable or bus and should not be spliced in a manner that
allows the cable to make a 3-way junction. Figure 2.3 shows the right way to
wire a network.
Figure 2.3
Correct Network Connection
Network
Connector
Workstation
Workstation
Workstation
2–2
Chapter 2
Installing a Network
Simple Network (cont’d)
Figure 2.3 shows the correct method of wiring a network. This figure shows
the cable coming into the Network Connector (Catalog No. 2708-NNC) and
making connection with the cable coming out of the connector. If the
workstations are removed from their respective network connectors, it is easy
to determine that a continuous cable or bus has been created.
The network is a signal transmission line and cannot be treated the same as a
power voltage line. The transmission line operates at considerably higher
frequencies and therefore must be properly wired and terminated (resistance
loaded). If this network transmission line is not installed properly, as shown
in Figure 2.3, then voltage standing wave reflections (VSWR) and various
other propagation phenomenon may occur.
This could cause workstations to not come on-line, drop off and on-line, or
have multiple communication retrys in order to make a signal connection.
ATTENTION: It must be emphasized that the network cable be
installed as a transmission line and not as a power voltage line.
!
As discussed in this section, a simple network consists of a single cable to
connect up to 32 workstations. This is called a “backbone” network and is
diagramed on Figure 2.4.
Figure 2.4
Simple Network Configuration
Host M—W—W—W—W—W—W—W—W—W
W Workstation
M Master
Indicates RS-232
Indicates RS-485 backbone
No more than 32 workstations can be connected to the same network cable.
If more than 32 workstations are required, refer to the Complex Networks
section.
The Network Connector (Catalog No. 2708-NNC)
The Network Connector is made up of three elements. These are (1) the
plastic shroud or hood, (2) the DB-9 connector, and (3) the four screw
terminal block. The terminal block is wired to the back of the DB-9
connector. The black terminal wire is connected to pin 5 of the DB-9
connector and is the network (–) side of the RS-485 network. The red
terminal wire is connected to pin 4 of the DB-9 connector and is the network
(+) side of the RS-485 network. The blue terminal wire is the workstation’s
terminal’s chassis ground, and is connected to pin 8. The last terminal slot is
open and is not connected to the DB-9 connector.
2–3
Chapter 2
Installing a Network
Simple Network (cont’d)
Figure 2.5
Network Connector (Catalog No. 2708-NNC)
Cabling a Network Using the Network Connector
Tools Needed — You will need a 3/32” flatblade screwdriver, and a pair of
wire strippers/cutter.
Cable Wire
The recommended cable is a Belden 8723. This cable has 2 pair of
conductors (4 wires) and a common drain wire. Although only one pair of
conductors is necessary for the network, it is desirable to have a back-up or
secondary pair in the event the primary pair has an open wire or some
unforseen malfunction occurs in the primary pair.
The primary cable pair consists of a Red and Black conductor which match
the color of the Network Connector leads. This primary pair will be used in
describing the cable connection.
Preparing the Wire
Check that the cable is cut off evenly. (There should be no wire hanging
beyond the cable insulation.) Remove about 3/4” of the insulation from the
end of the cable. Strip about 1/4” of insulation from the end of each wire.
Figure 2.6
Cable Connecting Length
1/4”
3/4”
2–4
Chapter 2
Installing a Network
Simple Network (cont’d)
Installing the Connector
There are two types of connections using the Network Connector. These are
a Master connection and a Non-Master connection. These connections are
shown on Figure 2.7. The physical network connector is shown on Figure
2.4. An examination of both figures shows that there are four open sockets in
which to place three wires; the network plus (+), the network (–), and the
shield wires. In the Network Connector, the three wires connecting the
terminal block to the pins in the DB-9 connector are color coded. This is
consistent with all Network Connectors. It is advised the cable be
color-coded to match the Network Connector to avoid confusion.
Master Connection
The network (–) wire is placed in the connector socket for pin 5 of the
network connector. The network (+) wire is placed in the connector socket
for pin 4 of the network connector. The shield or drain wire is placed in the
connector socket for pin 8 and is the ground connection.
The shield wire is placed in the blue connector socket ONLY in a MASTER
or SUB-MASTER connection. This will effectively ground the network
cable at the MASTER only, and eliminate ground loop current problems.
Figure 2.7
Schematic of the RS-485 Network Using the Network Connector
Master Workstation
Shield or
Drain
Wire
Network Connector (Catalog No. 2708-NNC)
Normal Workstation
Net (+) Net (–)
Normal Workstation
To Other
Workstations
2–5
Chapter 2
Installing a Network
Simple Network (cont’d)
NON-MASTER Connection
The following connections are NON-MASTER connections:
Normal
Concentrator
Alternate
Alternate Master
Alternate Sub-Master
All Non-Master workstations, with the exception of the last workstation in
the network, will have a cable going into and a cable coming out of the
network connector. This will cause two wires to be installed in each
connector socket. This is shown on Figure 2.8.
Figure 2.8
Two Wires in a Connector Socket
2–6
Twist the network (–) wires (black) together and place them in the black
connector socket and tighten the screw. Next, twist the network (+) wires
(red) together and place them in the red connector socket and tighten the
screw. The only cable leads left should be the drain or shield wires. Twist
these together and place them in the empty socket that has NO wire going to
the DB-9 connector. Tighten the screw and then examine all connections to
make sure they are secure and that no wires are touching any adjacent
connections to cause short circuits.
If the cable was cut and stripped according to instructions, it should be
straightforward to put the shroud on the network connector and complete the
assembly. When possible, it is advantageous to use the cable restraint device
in the connector to avoid pulling connections loose or breaking the wire.
Remember, cabling problems are the number one cause of problems in a
network.
Chapter 2
Installing a Network
Step By Step Installation
It is recommended that at least a simple volt/ohm meter along with assorted
screwdrivers be acquired for installation.
Figure 2.9
The Completed Network Connector
Making a good cable installation is one of the keys to having a properly
working network. Cable installation must always alternate between
installation and inspection. The inspector’s job is to play devil’s advocate at
each phase. By inspecting in phases, you avoid having to do the entire job
over again when problems are found too late.
We recommend the following sequence:
1. Obtain tools, select connectors and cable type. Get a sample of the cable
so you can identify the colors.
2. Draw a MAP of where each workstation is to be placed in the building or
area. Trace a general path that the cable will follow in the physical
building. Make multiple copies of this diagram. One good way to do the
map is to get blueprints of the building and draw in the cables and
workstations. Make sure that you note the WORKSTATION NUMBER
which will be in each location, as well as the location of the Host
computer.
3. Make color keyed cable drawings showing which color wires go to the
pins of the connectors. We recommend you make multiple copies of this
drawing, and store one copy with the installation map.
4. Run the cable through the building. Always leave a few extra feet at each
workstation location so that there is room with which to work.
2–7
Chapter 2
Installing a Network
Step By Step Installation
(cont’d)
5. Inspect the locations where the cable has been run, using a different
person than the installer. Make sure that the cable:
a. Is not run parallel to AC cables (BUILDING POWER) for more
than a few feet at any time. This will avoid induction of AC onto
your low voltage data network. Whenever the network cable must
cross AC power lines, they should cross perpendicular to each
other.
b. Is not allowed to rest on top of fluorescent lamps in the ceiling. The
ballasts from these lamps are worse than AC power lines.
c. Is never spliced in a manner that allows the cable to make a 3-way
junction. Network cables must be a bus. Only the Master
workstation and the last workstation can have a single network
cable going to them; all others will have two cables.
d. Is not located next to or run over large motors, building
transformers, or very large current areas, such as radiology labs.
e. Is not located where it is easily broken or shifted around.
Note: Make sure that the workstations are not next to building
transformers, or large electric motors. Induced voltage spikes can affect
the operation of the network.
6. Inspect visually every connector. It is recommended that a person, other
than the one who connected the wires, inspects the following:
a. Correct COLORS of wire have been connected.
b. Be sure that ALL of the strands of the conductor are properly
inserted into the connector. It is very easy to nick the wire when
stripping it. This results in the strands breaking.
c. Flex the wire at the connector a few times (this is not the time to
prove your strength, THEY CAN BE BROKEN) to see if the wire
has been badly nicked. It will break if this has occurred.
7. Inspect the pins for proper color in the proper hole.
8. Check continuity of the network cable by:
a. Temporarily short pins 4 and 5 of the MASTER workstation’s
network connector together. You can do this with a clip lead, or use
a female 9 pin solder type connector with pins 4 and 5 soldered
together. (You can get solder type connectors at local electrical
retailers.)
b. Set the voltmeter to the 100 OHM scale (or the nearest available
value).
2–8
Chapter 2
Installing a Network
Step By Step Installation
(cont’d)
c. At the next workstation location, place the meter on pins 4 and 5.
You should have almost no resistance. A good rule of thumb is 1
ohm for every 25 feet of network cable. If there is 400 feet of cable
to the Master, then there should be no more than 16 ohms of
resistance.
d. Try each workstation in turn, checking to see that the resistance
does not change drastically. If the resistance is high, you may have
a poorly crimped pin, or a partial break in the cable itself. If the
resistance is infinite (completely open), then there is a break, or a
broken conductor.
e. By going from one station to the next, you can isolate what
segment of the cable has a problem.
f. When the entire cable has been checked, remove the jumper from
the Master’s connector.
9. Install the hoods on the connectors. Attach the connectors to the
workstations.
The Terminator Switch
After the network is installed, it is usually necessary to cancel out signal
reflections inherent in any cable layout. To do this, flip on the terminator
switch underneath the MASTER and SUBMASTER WORKSTATIONS
ONLY. The terminator switch is on the bottom of the workstation. The ON
position is toward the top of the workstation.
Figure 2.10
Terminator Switch
Note: The terminator switch should be OFF on all workstations except the
MASTER and SUBMASTER. If other terminator switches are on,
indeterminate network conditions will occur.
Communication Cables
The cables used to communicate from the Host computer to the Master or
from a Concentrator to a Sub-Master workstation use either RS-232 or
RS-422 signal standards. The connector pin-out diagrams for all of the
possible workstation configurations are shown in Appendix D.
2–9
Chapter 2
Installing a Network
Testing the Network for Data Transmission
1. At the LAST workstation in the network, place the workstations into the
menu setup mode (see Appendix B).
a. Press the left arrow key (<) until the Diagnostic menu statement
appears in the display.
b. Press the ENTER key and then depress the left arrow key (<) until
RS-485 – BLK-Rx is shown on the display.
c. Press the ENTER key and the following should appear:
Rx = 00000 ERRS = 00
000
If the counters are not zero, press EXIT, then press ENTER, and they
should be set to zero.
d. Repeat steps a, b, and c for all workstations, except the Master
workstation.
2. At the Master workstation enter the Diagnostic menu and press the left
arrow key (<) until RS-485 – BLK-Tx is shown on the display.
a. Press ENTER and the display should show the following,
momentarily:
Tx = 00000 ERRS = 00
000
After the counters appear, the Tx counter will begin incrementing to
represent the number of blocks being transmitted over the network to all
workstations.
b. An observation of the display of the workstations placed in receive
will show the Rx counter changing accordingly as the transmitted
network blocks are received.
c. After a reasonable testing interval, press the EXIT key on the
Master workstation, thus suspending the network block test.
d. Examine each workstation to see that the Rx block count is the
same. It should be the same at all workstations (It is possible to be
off by one or two counts.) Also, inspect to see that ERRS count is
zero or less than three. Either a missing block count or high error
count indicates a bad network connection or a faulty workstation.
Exchanging the workstation will determine which is the case.
e. For additional confidence, perform step 1 at the Master workstation
location and step 2 at the last location. Step 1 may be repeated at all
other workstations. The changing of block transmission locations
verifies communications in the opposite direction.
f. Press EXIT three times on each workstation.
2–10
3. Always use retaining screws for all DB-9 connectors. Connect the RS-232
(or RS-422) cable to the host computer.
Chapter 2
Installing a Network
Communication to the Host Computer
Connect the WORKSTATION COM1 Port to the Host computer using a
cable wired according to the pin-out diagrams shown in Appendix D. To
communicate to the Host computer, it is necessary to be able to make your
computer send and receive ASCII characters in an asynchronous
communication manner. If a personal computer is used, programs such as
PROCOMM
R
, and KERMIT are ideal for this purpose. Most
ASYNCHRONOUS TERMINAL EMULATION PROGRAMS will work.
The communication set-up parameters must be the same for both the
computer and the workstation terminal. Please see Appendix B, Menu
Trigger Keys, for the procedure to enter the workstation menu mode.
If the program is resident in the workstation, press the menu trigger keys
(Enter and Right Arrow simultaneously), disconnect power, then reconnect
power while holding down the Enter and Right Arrow keys simultanenously
to enter the workstation menu mode.
1. In the menu mode
1—Network
Menu
will appear.
Press ENTER; “Terminal Number” will appear.
Press 1, then ENTER; “Terminal Type” will appear.
Press < – until the terminal type changes to “Master”,
then press ENTER, then press EXIT.
2. Press the < –, until “2-Comm Port Menu” appears. Press ENTER;
“Comm Port Mode” will appear.
Press < – until the mode changes to “XON/XOFF”.
①
Press ENTER; and “Comm Baud Rate” will appear.
3. Press < – until the baud rate is the SAME AS THE BAUD RATE
SELECTED ON THE HOST COMPUTER. 9600 and 1200 are the most
②
common baud rates.
In some cases NO character will show up if the
baud rate is improperly set.
Press ENTER; “Comm Data Bits” will appear.
4. Press < – until the Data Bits are the same as the Host computer. This is
normally 7.
Press ENTER “Comm Parity” will appear.
① For testing the cable connections, use XON/XOFF. If you are using a data collection program such as Network
Manager Software (Catalog No. 2708-NNM), you may have to change this to “POLLED” before using such
programs.
② If the baud rate is incorrectly set, when your computer sends characters to the workstation, unpredictable
characters will show up on the display when you are in “COMM RECEIVE TEST” mode. In some cases NO
character will show up if the baud rate is improperly set.
2–11
Chapter 2
Installing a Network
5. Press < – until the parity is the SAME AS THE PARITY SETTING ON
THE HOST COMPUTER. A selection of “EVEN” is commonly used.
③
Press ENTER; “Comm Stop Bits” will appear.
6. Press < – until “One” appears.
④
Press ENTER; “Comm CRLF” will appear.
7. Press < – until “ENABLED” appears.
⑤
Press ENTER; “Comm Echo” will appear.
8. Press < – until “ENABLED” appears.
⑥
Press EXIT; “1-Network Menu” will appear.
9. Press OUT; “Diagnostics” will appear.
Press ENTER; Press < – until “Comm Rx Test” appears.
Press ENTER;
10. The following should appear on the two line display:
DTR: ON CD: ON
Pressing the number 1 and 2 will turn DTR ON and OFF.
⑦
11. Start the communication program on the Host computer. If the program is
an asynchronous terminal emulator program, then characters that are
typed on the computer are sent directly over the communication line.
These characters should appear on the top line of the workstation
display.
⑧
2–12
12. Press EXIT; “Comm Rx Test” will appear.
Press OUT; “Comm Tx Test” will appear.
Press ENTER; The top line will be blank and the second line will show:
DTR: ON CD: ON
The Host computer should be receiving a continuous transmission of
③ If the parity is set incorrectly, the workstation will still RECEIVE characters properly. Your Host computer may not
receive correctly, if at all.
④ If the baud rate is incorrectly set, when your computer sends characters to the workstation, unpredictable
characters will show up on the display when you are in “COMM RECEIVE TEST” mode. In some cases NO
character will show up if the baud rate is improperly set.
⑤ If you find that your computer is receiving double spaced lines from the workstation, then set CRLF to
DISABLED. Also disable when using Network Manager Software (Catalog No. 2708-NNM) or similar software.
⑥ If you find that when you are using your workstation program, you see two characters for each one you type
(such as DDIISSPPLLAAYY//HHEELLOO//) then set Com Echo to DISABLED. Note that when using a data
collection program (such as Network Manager Software (Catalog No. 2708-NNM) you will also DISABLE this
option.
⑦ Your computer may be unwilling to transmit characters unless these RS-232 lines are in the proper state. If you
are having trouble communicating, check your cable diagram against the specifications for your computer’s
RS-232 port. Additionially, the workstation requires CD to be high (or on) for communications.
⑧ Random characters on your computer or the workstation display indicate the baud rate is wrong. If about half of
the characters are wrong or missing, the parity is set incorrectly. If nothing at all happens, the cable is wrong or
something is broken.
Chapter 2
Installing a Network
“The quick brown fox jumped over the lazy dog”⑨ type of messages.
Communications can receive at rates that are faster than any terminal
emulation program due to the use of POLLED mode as the COMM
PORT MODE.
13. Press EXIT, three times
14. The AUX port (labeled COM2 on the back of the workstation) can be set
up and checked out in the same manner as the primary COM1 port. The
AUX port, however, is strictly a data transfer port operating with
XON/XOFF flow control. It has transmit, receive, and signal ground
lines. There are no modem control lines on this port.
The installation of the workstation in a simple network is now complete.
Complex Network
Description of Large or Complex Network
Installing a large or complex network of workstations involves connecting
together several smaller networks.
The network which connects all of the smaller or sub-networks together is
called the “backbone” network. Each sub-network is referred to as a
“tributary” network. Up to 31 tributary networks may be attached to the
backbone to form a very large network. Each tributary, in turn, may contain
up to 32 workstations. A maximum of 1024 workstations may be connected
in this fashion. Once the layout of such a network has been determined,
cabling proceeds in the same manner as cabling for a single or backbone
network. Both tributary and backbone networks are wired as previously
described.
The workstation which is attached to the Host is configured as the “Master”.
Each workstation on the backbone network that connects to a tributary
network is configured as “Concentrator”. The workstation on the tributary
which attaches to the Concentrator is configured as the “Sub-Master”.
⑨ After a few seconds or minutes of receiving these messages, your computer starts displaying wrong characters or
only parts of messages, then your computer (or the communications program) is unable to accept records at the
rate they are being sent by the workstation. Try a lower baud rate on your Host and the workstation until you can
receive successfully as quickly as the data is sent. Note that some programs such as Network Manager Software
(Catalog No. 2708-NNM) can receive at rates that are faster than any terminal emulation program due to the use
of POLLED mode as the COMM PORT MODE.
2–13
Chapter 2
Installing a Network
Figure 2.11
Large Network Configuration
Host M—W—C—W—C—W—C—W—W—C—C—W
W
|
W
|
W
|
S
|
|
S
|
W
|
W
|
W
|
W
|
S
|
W
|
W
|
W
W
|
W
|
S
|
|
S
|
W
|
W
2–14
Key:
W Workstation
S Submaster
C Concentrator
M Master
Indicates RS-232 or RS-422 connection
Indicates RS-485 backbone
Indicates a tributary
All of the workstations, including Masters, Concentrators and Submasters,
are standard workstations which have been configured for their individual
roles in the network. A configuration parameter is changed to allow any
workstation to adopt a new role in the network. Each workstation is capable
of operating in both a data collection and a data communications mode.
A workstation which is being used as a Master, Concentrator, or
Submaster can perform data collection functions even while serving in
the communication network.
Alternate Communication Links
When installing large networks, you may consider redundant communication
links in order to protect against Host or Master workstation failures. This
involves establishing certain workstations as “Alternate Sub-Masters”.
Configuring a large network with Alternate Masters will allow the alternate
workstation to take over communication operations if the designated Master
becomes inoperable or is removed from the network. An Alternate Host
provides full redundancy for collection in the event of a Host failure.
Chapter 2
Installing a Network
Figure 2.12
Large Network Configuration with Alternate Masters
Host 1 M—A—C—C—C—W—C—C—W—C—C—C
Host 2
S
AS
W
|
|
S
|
|
W
|
|
W
|
W
W
|
W
|
AS
S
W
|
W
|
|
|
S
|
|
S
|
AS
|
W
Key:
W Workstation
S Submaster
M Master
C Concentrator
A Alternate Master
AS Alternate Submaster
Indicates RS-232 or RS-422 connection
Indicates RS-485 backbone
Indicates a tributary
An Alternate Submaster will allow the communication operations to continue
through a secondary Concentrator if the primary Concentrator becomes
inoperable or is removed from the network.
Networks Over Telecommunications Lines
It is possible to configure a workstation network which spans multiple
buildings, outposts, or sub-stations located at remote sites. Switched or
leased telephone lines can be used with asynchronous modems to provide
communication links for such a network.
Asynchronous short-haul modems may be used to extend the normal RS-232
communication distance from 100 feet to as much as several miles. To use
modems for communications between a Concentrator and Submaster the
workstations MUST have an RS-232 communication port (Workstation
Catalog No. 2708-DH5B2L). A modem cable must be correctly connected to
TXD, RXD, RTS, CTS, DSR, DTR, and GROUND signals (see Appendix
D). The COMM BAUD RATE parameter must be changed to the same baud
rate as the modem.
2–15
Chapter 2
Installing a Network
As soon as the modems establish communication between themselves, the
remote system will be ready for use.
Extension of a network across telephone lines consists of placing a modem
on one side of the line to connect with the Concentrator, and placing another
modem on the other side to connect with the Submaster.
Figure 2.13
Extending Network Across Common Carrier
Backbone
Network
W
|
M
|
W
|
W
|
C
|
W
|
W
Key:
W Workstation
S Submaster
C Concentrator
M Master
Figure 2.14
Use of the Gateway Option
Backbone
Network
W
|
W
|
G
|
W
|
W
HOST
modem modem
Telco
Indicates RS-232 connect
Indicates telephone line
Indicates RS-485 backbone
modem modem
Telco
Tributary
Network
W
|
W
|
W
|
S
|
W
Tributary
Network
W
|
S
|
W
2–16
Key:
W Workstation
S Submaster
C Concentrator
M Master
G Gateway
Indicates RS-232 connect
Indicates telephone line
Indicates RS-485 backbone
Chapter
Chapter Objectives
A–B
3
Barcode Connection
The barcode connector on the back of the workstation is a 9 pin DB-9
connector for the bar code scanner.
Connection
The pin-out for the BARCODE connector on the back of the workstation is
shown on Figure 3.1.
Figure 3.1
BARCODE Connector
54321
9876
Pin Number Function
1 Start of Scan. . . . . . . . . . . . . . .
2 Data. . . . . . . . . . . . . . .
3 LED light. . . . . . . . . . . . . . .
4 NOT CONNECTED. . . . . . . . . . . . . . .
5 Trigger. . . . . . . . . . . . . . .
6 Laser synchronization. . . . . . . . . . . . . . .
7 GROUND. . . . . . . . . . . . . . .
8 GROUND. . . . . . . . . . . . . . .
9 Power (+5V). . . . . . . . . . . . . . .
Allen-Bradley offers the following barcode scanners for use with the
workstation:
— Catalog Number 2755-G3 or -G6 Hand-Held Scanner
— Catalog Number 2755-W1, -W2, or -W5 Wand
— Catalog Number 2755-B1 or -B2 Slot Scanner
3–1
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