GE Fanuc IC693CMM301
http://www.plcpart.com/ge-fanuc/series-90-30/IC693CMM301/
Series 90-30 PLC
Genius Communications
919-535-3181
sales@plcpart.com
GE Fanuc Automation
Programmable Control Products
Series 90 -30
Genius
Communications Module
User’s Manual
GFK-0412B August 1997
PDFsupply.com
GFL–002
Warnings, Cautions, and Notes
as Used in this Publication
Warning
Warning notices are used in this publication to emphasize that
hazardous voltages, currents, temperatures, or other conditions that
could cause personal injury exist in this equipment or may be
associated with its use.
In situations where inattention could cause either personal injury or
damage to equipment, a Warning notice is used.
Caution
Caution notices are used where equipment might be damaged if care is
not taken.
Note
Notes merely call attention to information that is especially significant to
understanding and operating the equipment.
This document is based on information available at the time of its publication. While
efforts have been made to be accurate, the information contained herein does not
purport to cover all details or variations in hardware or software, nor to provide for
every possible contingency in connection with installation, operation, or maintenance.
Features may be described herein which are not present in all hardware and software
systems. GE Fanuc Automation assumes no obligation of notice to holders of this
document with respect to changes subsequently made.
GE Fanuc Automation makes no representation or warranty, expressed, implied, or
statutory with respect to, and assumes no responsibility for the accuracy, completeness,
sufficiency, or usefulness of the information contained herein. No warranties of
merchantability or fitness for purpose shall apply.
The following are trademarks of GE Fanuc Automation North America, Inc.
Alarm Master
CIMPLICITY
CIMPLICITY Control
CIMPLICITY PowerTRAC
CIMPLICITY 90-ADS
CIMSTAR
Field Control
GEnet
Genius
Genius PowerTRAC
Helpmate
Logicmaster
Modelmaster
PowerMotion
ProLoop
PROMACRO
Series Five
Series 90
Series One
Series Six
Series Three
VuMaster
Workmaster
Copyright 1990–97 GE Fanuc Automation North America, Inc.
All Rights Reserved
PDFsupply.com
Series 90 -30 Genius Communications Module User’s Manual – August 1997 iii
GFK-0412B
Preface
This book describes the features, installation, and operation of the Series 90 -30
Genius Communications Module.
Contents of this Manual
This book contains the following chapters:
Chapter 1. Introduction: describes the capabilities and appearance of the Genius
Communications Module and lists its specifications.
Chapter 2. Hardware Installations: explains how to install or remove a Genius
Communications Module and how to remove and replace the module’s Terminal
Assembly. This chapter also explains how to choose and install the bus cable, and how to
install an optional connector for a Genius Hand-held Monitor.
Chapter 3. Operation and Timing: explains how the GCM sends, receives, and allocates
Global Data. It also describes how other devices on the bus handle GCM Global Data
and explains how to estimate the bus scan time contribution of the GCM.
Chapter 4. Configuration: describes the module’s selectable features and summarizes
configuration steps for a Hand-held Programmer.
Appendix A. Characteristics of the Genius Bus.
Appendix B. Comparison of the GCM and GCM+.
Changes in This Version of the Manual
This manual has been extensively revised and reorganized. Major changes include:
1. General information about the GCM+ module and Series 90-30 Genius Bus
Controller has been added.
2. Information on operation and timing considerations is now combined in one
chapter.
3. A section on compatibility has been added.
4. Information on bus cable types has been updated and expanded.
5. Information on bus installation has been expanded.
6. Instructions have been added for installing an optional Genius Hand-held
Monitor connector.
7. The module configuration chapter has been restructured to include Hand-held
Programmer configuration steps with enhanced parameter definitions.
8. An appendix detailing the electrical characteristics of the bus has been added.
9. Another appendix comparing the GCM and GCM+ modules has also been
added.
PDFsupply.com
Preface
Series 90 -30 Genius Communications Module User’s Manual – August 1997
iv GFK-0412B
Related Publications
For more information, refer to the following publications:
Series 90-30 Installation and Operation Manual (GFK-0356): This manual is the primary
reference for information about the Series 90-30 PLC.
Hand-held Programmer User’s Manual (GFK-0402): This book describes the Hand–held
Programmer displays, and explains operator procedures for module configuration,
programming, and data monitoring.
Logicmaster 90-30 Software User’s Manual: This manual explains how to use the
Logicmaster 90-30 software for programming and configuring a Series 90-30 PLC.
Genius I/O System User’s Manual (GEK-90486-1): Reference manual for system designers,
programmers, and others involved in integrating Genius I/O products in a PLC or host
computer environment. This book provides a system overview, and describes the types
of systems that can be created using Genius products. Datagrams, Global Data, and data
formats are defined.
We Welcome Your Comments and Suggestions
At GE Fanuc automation, we strive to produce quality technical documentation. After
you have used this manual, please take a few moments to complete and return the
Reader’s Comment Card located on the next page.
Jeanne Grimsby
Senior Technical Writer
PDFsupply.com
1
section level 1
figure bi level 1
table_big level 1
Restarts for autonumbers that do not restart in each
chapter.
figure bi level 1, reset
table_big level 1, reset
chap_big level 1, reset1
app_big level 1, resetA
figure_ap level 1, reset
table_ap level 1, reset
figure level 1, reset
table level 1, reset Table 1.
these restarts must be in the header frame of chapter 1.
a:ebx, l 1 resetA
a:obx:l 1, resetA
a:bigbx level 1 resetA
a:ftr level 1 resetA
c:ebx, l 1 reset1
c:obx:l 1, reset1
c:bigbx level 1 reset1
c:ftr level 1 reset1
Reminders for autonumbers that need to be restarted
manually (first instance will always be 4)
let_in level 1: A. B. C.
letter level 1:A.B.C.
num level 1: 1. 2. 3.
num_in level 1: 1. 2. 3.
rom_in level 1: I. II. III.
roman level 1: I. II. III.
steps level 1: 1. 2. 3.
1-1
GFK-0412B
Chapter 1 Introduction
The Series 90 –30 Genius Communications Module (IC693CMM301) is an intelligent
module that provides automatic, “global data” communications between a Series 90-30
PLC and up to 7 other devices on a Genius bus.
Global Data is data that is transmitted automatically and repeatedly, allowing the
formation of a shared database. A Genius Communications Module can exchange up to
a total of 256 bits (32 bytes) of Global Data.
Series 90-30
Series 90–70
Bus Cont
r
olle
r
Series 90-30 HHP
GCM
Computer Used
for Programming
and Configuration
Genius Bus
PCIM
Computer Used
for Data Monitoring
The illustration above represents a Series 90-30 PLC with a Genius Communications
Module that can exchange Global Data with a Series 90-70 PLC and a computer
equipped with a PCIM card. The diagram also shows a Hand-held Programmer and a
computer, both of which can be used to configure the Series 90-30 PLC and GCM. The
GCM can monitor input data from I/O devices; however, it cannot control I/O devices.
Other Genius Options for the Series 90-30 PLC
There are two other Genius modules for the Series 90-30 PLC:
The Enhanced Genius Communications Module (GCM+). The GCM+ can exchange
up to 128 bytes of Global Data with up to 30 other devices on the bus. The GCM+
provides diagnostics information and can potentially operate without a host PLC
program. The GCM+ module cannot be installed in the same Series 90-30 PLC as a
GCM module. See appendix B for a comparison of the features of the GCM and
GCM+.
The Series 90-30 Genius Bus Controller. The Bus Controller can exchange up to 128
bytes of Global Data and/or I/O control data. It can be used to interface the Series
90-30 PLC to Genius I/O Blocks, Remote Drops, and Field Control I/O Stations, as
well as other types of controllers. A Bus Controller cannot be installed in the same
Series 90-30 PLC as a GCM module.
PDFsupply.com
Contents
v
GFK-0412B Series 90 -30 Genius Communications Module User’s Manual – August 1997
Chapter 1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEDs 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compatibility 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2 Hardware Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Installation and Removal 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Removal 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminal Assembly Removal and Installation 2-3. . . . . . . . . . . . . . . . . . . . . . . . .
Bus Cable Selection 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Other Cable Types 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus Length 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baud Rate Selection 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus Installation 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Guidelines 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lightning Transient Suppression 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a Hand-held Monitor Connector 2-10. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3 Operation and Timing 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Global (%G) Memory in the Series 90-30 PLC 3-2. . . . . . . . . . . . . . . . . . . . . . .
How the Devices on the Bus Handle GCM Global Data 3-4. . . . . . . . . . . . . .
Timing Considerations 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Estimating Bus Scan Time 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relationship Between the Bus Scan and the CPU Sweep 3-8. . . . . . . . . . . . . . .
Estimating Data Response Time 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus Scan Time (Tbus) 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Execution Time (Tcpu) 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sending Data in Reply to Global Data Received 3-11. . . . . . . . . . . . . . . . . . . .
Chapter 4 Configuration 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Planning 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configurable Features 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slot Number 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Number 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baud Rate 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Global Data Length 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PDFsupply.com
Contents
vi
Series 90 -30 Genius Communications Module User’s Manual – August 1997 GFK-0412B
Appendix A Characteristics of the Genius Bus A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Interface A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Bus Waveforms A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Effect of Long Cables, Repeaters, or Unspecified Cable Types on Maximum Length
Bus A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Data Format A-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus Access A-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus Errors Caused by Noise A-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B Comparison of the GCM and GCM+ B-1. . . . . . . . . . . . . . . . . . . . . . . . . .
PDFsupply.com
1
1-2 Series 90 -30 Genius Communications Module User’s Manual – August 1997
GFK-0412B
Module Description
The Genius Communications Module is a standard Series 90-30 PLC module. It plugs
easily into the PLC’s backplate. The latch on the bottom of the module secures it in
position.
The module’s Terminal Assembly, with its protective hinged cover, is removable. Bus
connections are made to the Terminal Assembly and routed out through the bottom. The
Terminal Assembly can be removed without breaking the bus and disrupting Genius
communications if appropriately installed as described in chapter 2.
LATCH
REMOVABLE
TERMINAL
ASSEMBLY
HINGED
COVER
COMM OK
(LED)
OK
(LED)
a43394
There are no DIP switches or jumpers to set on the module. Its configuration is
completed using the Hand–held Programmer or system programming software.
LEDs
LEDs on the front of the Genius Communications Module indicate its operating status,
and the status of communications between the module and the Series 90-30 PLC.
indicates that the module has passed its powerup test and is operating.
indicates that the Series 90-30 PLC has initialized the module, and that
the module is receiving communications from the bus.
After successful startup, COM should remain ON unless an excessive number of
communications errors occur. Ten errors in ten seconds, caused by noise on the bus,
improper wiring, baud rate conflict, or Device Number conflict will cause COM to blink.
OK
COM
PDFsupply.com
1
1-3
GFK-0412B
Chapter 1 Introduction
Specifications
Ordering Information IC693CMM301, –304
Module Type Series 90-30 PLC module, providing Global Data
communications with up to 7 other PLCs.
LEDs OK, COM
Global Data Length:
per Communications Module Up to 256 bits, configurable in 32–bit increments.
per Series 90–30 PLC Up to maximum available %G memory
Environmental:
Operating Temperature 0 C to +60 C
(+32 F to +140 F)
Storage Temperature –25 C to +70 C
(–13 F to +158 F)
Humidity 5% to 95% (non–condensing)
Vibration and Shock 0.2 inch displacement 5Hz to 10Hz
1 G 10Hz to 200Hz
5 G 10Ms duration
Compatibility
Remote Racks: Genius Communications Modules that are version IC697CMM301F/304F
or later can be located in a remote rack. Earlier module versions can be upgraded for this
purpose using Upgrade Kit: 44A286397-G03.
PLC CPU: Genius Communications Modules that are version IC697CMM301E/304E or
earlier are not compatible with PLC CPU models: IC693CPU311H, -321H, and -331J or
later. They can be upgraded using Upgrade Kit: 44A286397-G03.
This module is compatible with any Bus Controller, PCIM, or QBIM on the bus, except
Series Six Bus Controller models IC66*CBB900, -901, -902E or earlier, or -903E or earlier.
The GCM cannot be installed in the same Series 90-30 PLC as a Series 90-30 Genius Bus
Controller.
The GCM cannot be installed in the same Series 90-30 PLC as an Enhanced Genius
Communications Module (GCM+).
A Genius Hand–held Monitor can be used to display: the GCM Bus Address, its
software version, and the Series Six register address configured for global data. HHM
version IC660HHM501H (rev. 4.5) or later is required. There is no Hand–held Monitor
connector on the GCM module, but a Hand–held Monitor may communicate with the
GCM while connected to any other device on the bus. Optionally, an additional HHM
mating connector can be installed on the bus near the GCM.
Genius I/O blocks may be present on the same bus. However, the GCM is not compatible
with older “phase” A blocks; they should not be installed on the same bus.
Series 90–30
PLC
Bus Controllers
Enhanced Genius
Communications
Module (GCM+)
Genius Hand
–
held Monitor
Genius I/O Blocks
PDFsupply.com
2
section level 1
figure bi level 1
table_big level 1
2-1
GFK-0412B
Chapter 2 Hardware Installation
This chapter explains how to:
install and remove a Genius Communications Module
remove and install the module’s Terminal Assembly
select and install the Bus Cable
connect and terminate the communications bus
plan system wiring installation and protect against lightning surges
install a separate Genius Hand-held Monitor connector on the bus
Module Installation and Removal
The Genius Communications Module may be installed and removed in the same
manner as all other Series 90-30 modules. Power must be OFF when installing or
removing the module.
Module Installation
To install the Genius Communications Module in the Series 90-30 PLC backplate:
1. Grasp the module with the terminal board toward you and the rear hook facing away
from you.
2. Align the module with the desired base slot and connector. Tilt the module upward
so that the top rear hook on the module engages the slot on the baseplate.
3. Swing the module downward until the connectors mate and the locking lever on
the bottom of the module snaps into place, engaging the baseplate notch.
a43055
Note the slot number; this number must be entered when the module is configured.
PDFsupply.com
2
2-2 Series 90 -30 Genius Communications Module User’s Manual – August 1997
GFK-0412B
Module Removal
The module can be removed without powering down the communications bus,
provided the incoming and outgoing Serial 1 wires have been connected to one terminal
and the Serial 2 wires have been connected to one terminal. If this has been done, do
not disconnect the bus cable or any terminating resistor. Remove the Terminal
Assembly from the front of the Genius Communications Module carefully. Avoid contact
with exposed cable wiring. Place the Terminal Assembly, with the bus wiring still
attached, in a protected location.
Caution
If exposed wiring comes in contact with conductive material, data on
the bus may be corrupted, possibly causing the system to shut down.
If the rest of the bus is powered down, the bus wiring can be removed from the module.
To remove the module:
1. Locate the release lever on the bottom of the module. Firmly press it up toward the
module.
2. While holding the module firmly at the top, continue fully depressing the release
lever and swing the module upward.
3. Disengage the hook at the top of the module by raising the module up and moving
it away from the baseplate.
a43056
PRESS
RELEASE LEVER
PDFsupply.com
2
2-3
GFK-0412B
Chapter 2 Hardware Installation
Terminal Assembly Removal and Installation
The Terminal Assembly of all Series 90-30 modules can be removed or installed from the
module as described below.
Terminal Assembly Removal
1. Open the hinged cover on the front of the module.
2. There is a jacking lever above the wiring terminals, on the left. Push this lever
upward to release the terminal block.
JACKING
LEVER
a43061
3. Grasp the narrower pull–tab located at the right of the retaining tab. Pull the tab
toward you until the contacts have separated from the module housing and the
hook has disengaged.
PULL
TAB
a43715
PDFsupply.com
2
2-4 Series 90 -30 Genius Communications Module User’s Manual – August 1997
GFK-0412B
Terminal Assembly Installation
To replace the Terminal Assembly, follow the steps below. If wiring is already in place, be
sure that the Terminal Assembly is being connected to the proper type of module.
Caution
Check the label on the hinged door and the label on the module to be
sure they match. If a wired Terminal Assembly is installed on the
wrong module type, damage to the module may result.
1. If the pull tab at the top of the Terminal Assembly is extended, push it back. Close
the Terminal Assembly door.
2. Place the hook at the bottom of the Terminal Assembly into the corresponding slot at
the bottom of the module.
3. Pivot the Terminal Assembly upward and firmly press it into position.
4. Open the door and check to be sure that the latch is securely holding the Terminal
Assembly in place.
a43062
2
3
1
REFER TO TEXT FOR
INSTALLATION PROCEDURE
PDFsupply.com
2
2-5
GFK-0412B
Chapter 2 Hardware Installation
Bus Cable Selection
The Genius bus is a shielded twisted-pair wire, daisy-chained from block to block and terminated at both
ends. Proper cable selection is critical to successful operation of the system.
Each bus in the system can be any cable type listed in the table below. Do not mix cables of different impedance,
regardless of cable run length. Do not mix cable types in long and/or noisy installations.. Other, small-size twisted
pair shielded wire of unspecified impedance can be used for short runs of 50 feet or less, using 75 ohm
terminations. Selection of wire type may be limited by local and national codes and industry standards. Consult
the cable manufacturer to determine the cable’s suitability for a particular type of installation.
Conservative wiring practices and national and local codes require physical separation between control circuits and power distribution or motor power. Refer to sections 430 and 725 of the National Electric Code. Also
refer to Appendix A for more detailed information about the bus.
Cable #
& Make
NEC
(USA)
Outer
Diameter
Terminating
Resistor*
Number of
Conduc-
Dielectric
Voltage
Ambient
Temp
Maximum Length Cable Run,
feet/meters at baud rate
Type –10%to+20%
1/2 Watt
tors/
AWG
Rating Rating
153.6s 153.6e 76.8 38.4
(A)9823
(C)4596
(M)M39240
none
CL2
CM
.350in
8.89mm
150 ohms 2 / #22 30v 60C 2000ft
606m
3500ft
1061m
4500ft
1364m
7500ft
2283m
(B)89182 CL2P .322in
8.18mm
150 ohms 2 / #22 150v 200C 2000ft
606m
3500ft
1061m
4500ft
1364m
7500ft
2283m
(B)9841
(M)M3993CMCL2
.270in
6.86mm
120 ohms 2 / #24 30v 80C 1000ft
303m
1500ft
455m
2500ft
758m
3500ft
1061m
(A)9818C
(B)9207
(M)M4270
CL2
CM
CM
.330in
8.38mm
100 ohms 2 / #20 300v 80C 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(A)9109
(B)89207
(C)4798
(M)M44270
CL2P
CM
*
CMP
.282in
7.16mm
100 ohms 2 / #20 150v 200C 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(A)9818D
(B)9815
none
*
.330in
8.38mm
100 ohms 2 / #20 1500ft
455m
2500ft
758m
3500ft
1061m
6000ft
1818m
(O)911264**none .260in
6.60 mm
100 ohms 2 / #22 flex-
ing
250V 80C 1500ft
455m
2000ft
606m
3000ft
909m
4500ft
1364m
(E)532185
BBDN
CM approx .50in
(12.7mm)
100 ohms 4 pairs #24
(solid)
>150V 80C 1500ft
455m
2000ft
606m
3000ft
909m
4500ft
1364m
(A)9818
(B)9855
(M)M4230
*
CM
CM
.315in
8.00mm
100 ohms 4 (two pair)
#22
150v 60C 1200ft
364m
1700ft
516m
3000ft
909m
4500ft
1364m
(A)9110
(B)89696
(B)89855
none
CMP
CMP
.274in
6.96mm
100 ohms 4 (two pair)
#22
150v 200C 1200ft
364m
1700ft
516m
3000ft
909m
4500ft
1364m
(A)9814C)
(B)9463
(M)M4154
none
CM
CL2
.243in
6.17mm
75 ohms 2 / #20 150v 60C 800ft
242m
1500ft
455m
2500ft
758m
3500ft
1061m
(A)5902C
(B)9302
(M)M17002
none
CM
CM
.244in
6.20mm
75 ohms 4 (two pair)
#22
300v 80C 200ft
60m
500ft
152m
1200ft
333m
2500ft
758m
Notes: A = Alpha, B = Belden, C = Consolidated, E = Essex, M = Manhattan, O = Olflex
= Limited to 16 taps at 38.4 Kbaud
* = not known
**= Suitable for applications requiring high flexibility, continuous flex or vibration.
NEC classes are based on data obtained from manufacturers and are subject to change. CANADIAN CEC
codes are generally similar. Other countries may vary. The serial bus can be treated as a Class 2 circuit when
appropriate wiring practices are followed. Maximum available bus lengths may be affected when installation
requires the high voltage rated CM (Communications) rating. CM types can replace CL2, but not vice versa.
PDFsupply.com
2
2-6 Series 90 -30 Genius Communications Module User’s Manual – August 1997
GFK-0412B
Using Other Cable Types
The cable types listed in the preceding table are recommended for use. If the cable types
listed above are not available, the cable selected must meet the following guidelines.
1. High quality construction. Most important is uniformity of cross section along the
length of the cable. Poor quality cable may cause signal distortion, and increase the
possibility of damage during installation.
2. Precision-twisted shielded wire of EIA RS422 standard type, having a uniform
number of twists per unit of length. In a catalog, this type of cable may also be listed
as twinaxial cable, data cable, or computer cable.
3. Relatively high characteristic impedance; 100 to 150 ohms is best; 75 ohms is the
minimum recommended.
4. Low capacitance between wires, typically less than 20pF/foot (60pF/meter). This
may be accomplished by inner dielectrics of foamed type, usually polypropylene or
polyethylene, having a low dielectric constant. Alternatively, the conductors may be
spaced relatively far apart. Lower impedance types have smaller cross–sections, and
provide easier wiring for shorter total transmission distances.
5. Shield coverage of 95% or more. Solid foil with an overlapped folded seam and drain
wire is best. Braided copper is less desirable; spiral wound foil is least desirable.
6. An outer jacket that provides appropriate protection, such as water, oil, or chemical
resistance. While PVC materials can be used in many installations, Teflon,
polyethelene, or polypropylene are usually more durable.
7. Electrical characteristics: cable manufacturers’ information about pulse rise time and
NRZ data rate is useful for comparing cable types. The Genius bit consists of three
AC pulses; the equivalent NRZ bit rate is about three times as great.
For assistance in selecting a cable type, please consult your local GE Fanuc application engineer.
Bus Length
The maximum bus length for shielded, twisted-pair cable is 7500 feet. Some cable types
are restricted to shorter bus lengths. If the application requires greater bus length, fiber
optics cable and modems can be used. For more information, see the Genius I/O System
and Communications Manual.
Baud Rate Selection
The bus length determines which baud rate may be selected. A Genius bus can operate
at one of four baud rates: 153.6 Kbaud standard, 153.6 Kbaud extended, 76.8 Kbaud, or
38.4 Kbaud. The baud rate selected should be indicated on all devices, especially if
different busses in the facility use different baud rates. The baud rate must be configured
using a Hand-held Programmer or the system configuration software.
Note that in noisy environments, 153.6 Kbaud extended provides improved noise
immunity with little effect on bus scan time. If a system is experiencing excessive
blinking of the bus controller’s COMM OK light, or if the I/O blocks’ I/O Enabled LEDs
go off frequently, 153.6 Kbaud extended should be used.
PDFsupply.com
Loading...