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1771-IE
User Manual
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Rockwell Automation 1771-IE, D17716.5.7 User Manual

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AllenBradley
Analog Input Module
User
(Cat.
No. 1771-IE)
Manual

Table of Contents

Using This Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Objective
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Publications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of the Analog Input Module 21. . . . . . . . . . . . . . . .
How the Input Module Converts Analog Signals 23. . . . . . . . . . . . . .
Input Data Format 24
Objectives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Analog Input Module 31. . . . . . . . . . . . . . . . . . .
Objectives
ou Install the Input Module
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . .
the Input Module
31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31. . . . . . . . . . . . . . . . . . . . . . .
38. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming the Analog Input Module 41. . . . . . . . . . . . . . .
Objectives
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Family Example Family Example
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contentsii
Calibrating the Analog Input Module 51. . . . . . . . . . . . . . . . .
Objective
Information
Equipment
the Input Module
the Switches
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52. . . . . . . . . . . . . . . . . . . . . . . . . . . .
53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer (Multiple GET) for PLC2/20 A1. . . . . . . . . . . .
Example Program A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assumptions A1 Description A3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Channel Transfer for PLC Processors B1. . . . . . . . . . .
Example Program B1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Logic B6 Assumptions B7 Using Less Than Eight Input Channels B7
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Using This Manual
Chapter
1

Chapter Objective

Purpose of This Manual

Audience

Warnings and Cautions

This chapter tells you how to use this manual efficiently.
This manual shows you how to use your 8-bit Analog Input Module with an Allen-Bradley programmable controller. It helps you install, program, calibrate, and troubleshoot your module.
We assume that you know how to program and operate an Allen-Bradley programmable controller. In particular, you should know how to program block transfer. If you do not, refer to the appropriate programming and operations manual before you use the 8-bit Analog Input Module.
This manual contains warnings and cautions. A warning tells where you may be injured if you use your equipment improperly. Cautions tell where equipment may be damaged from misuse.
You should read and understand cautions and warnings before performing the procedures they precede.

Related Publications

Quick Locator

For a list of publications with information on the Allen-Bradley line of modules and programmable controllers, consult our publication index (SD499).
You will find the following terms or concepts described as follows:
Block Transfer Programs Page 4-1 Calibration Page 5-1 Configuration Switches Page 3-9, 5-3 External Power Supply Page 3-2 Input Channel Ranges Page 2-2 Input Data Format Page 2-4 Specifications Page 2-6 Status Bits Page 2-5 Wiring/Grounding Page 3-4, 3-8
11
Chapter
2
Overview of the Analog Input Module

Chapter Objectives

Description

This chapter gives you a functional and hardware overview of the analog input module.
The module (Figure 2.1) senses analog signals at its inputs and converts these signals to 3-digit Binary Coded Decimal (BCD) values (0 to 255 BCD) for use by your programmable controller.
Figure 2.1
Input Module
Analog
Keying Slots
Pink Identification
Label
Range/Calibration Date Label
Labels Identify Module Type/Series
Protective Covers
Label Specif ies Terminal Connection
Wiring Arm Connects Here
17996
The module accepts up to eight analog signals having a single voltage or current range that you select based on the type of input devices required by your application. It allows your programmable controller to
21
Chapter 2
Overview of the Analog Input Module
manipulate values representing temperature, pressure, rotational speed, light intensity, and position.
A wiring arm (cat. no. 1771-WB) accompanies the module. It acts as a terminal strip for input connections. The wiring arm pivots on the I/O chassis to connect with terminals on the front of the input module. Thus, the wiring arm lets you quickly connect or disconnect your input wiring when inserting or removing the input module from the I/O chassis.
The input module meets the requirements of the Instrument Society of America, Standard S50.1 (1975), “Compatibility of Analog Signals for Electronic Industrial Process Instruments.”

Input Channels

The input module supports eight single-ended input channels. All eight channels have the same voltage or current range that you select when ordering the module. The range is factory set and calibrated.
Nominal
Range:
1 to 5 V 4 to 20mA
0 to 5 V 0 to 20 mA
10 to 10V
20 to 20 mA
0 to 10 V
Precise Range:
1 to 4.9844 V 4 to 19.937 mA
0 to 4.980 V 0 to 19.922 mA
10 to 9.922V
20 to 19.844 mA
0 to 9.96 V
Units/Bit: Order
Code
15.60 mV/bit
0.063 mA/bit
19.53 mV/bit
0.078 mA/bit
78.13 mV/bit
0.156 mA/bit
39.06 mV/bit
01 05
02 06
03
07
04
When ordering 1771-IE modules, place the order code as a suffix to the catalog number. For example, 1771-IE-04.
You can change from a voltage range to the equivalent current range and vice versa within limited catagories. For example, from the above table you can switch from a range of (1 to 5 VDC) to (4 to 20 mA) or (0 to 5 VDC) to (0 to 20 mA) without recalibrating.
How Analog Modules Communicate With Programmable Controllers
22
Analog input modules communicate with a programmable controller by block transfer in the following manner (Figure 2.2).
Chapter 2
Overview of the Analog Input Module
Figure 2.2 Communication
Between Input Module and Processor
2
1
Input Device
8- BIT Input Module (cat.no.1771-IE)
3
BTR
4 5
PC Processor (PLC2/30 Processor Shown)
14164
1. Input devices generate analog signals which are transmitted to the
input module.
How the Input Module Converts Analog Signals
2. The input module converts analog signals into BCD values and
stores them until the processor requests a transfer of data.
3. When instructed by your ladder diagram program, the processor
performs a read block transfer of the values and stores them in its data table.
4. Your program can determine that the transfer was made without
error, and that the values are within a specified range.
5. Your program can use and/or move the data before it is written over
by the transfer of new data in a subsequent block transfer.
The input module converts analog signals to digital values readable by your processor (Figure 2.3).
The input module scans its inputs every 2.5ms and converts analog data to a digital format. It stores this data momentarily until transferred to the processor’s data table. The module reserves the last 200 microseconds of
23
Chapter 2
Overview of the Analog Input Module
each input scan for formatting data, and cannot accept block transfers during this time.
Figure 2.3
Conversion and Formatting
Input
129
Measurement of analog voltage or current value
10000001
(129)
Converted to a
binary value
0001 0010
(1) (2) (9)
Converted to
a BCD value
Status added by the module
17 16 - 14 13 - 0
Over/
Under flow
Channel
number
Stored in memory
1001
(129)
Analog
value
(BCD)
14159

Input Data Format

24
Input data is transferred to the processor in 12-bit 3-digit BCD format with a range of 0-255.
The processor stores the data in 16-bit input words (Figure 2.4). The 16 bits are used as follows:
Figure 2.4
Input W
Analog
Chapter 2
Overview of the Analog Input Module
ord
Overflow/ Underflow Bit
High Byte Low Byte
0 = within range 1 = out of range
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
00
Channel Address (see table)
Most Significant Digit (0-2)
Middle Digit (0-9)
Least Significant Digit (0-9)
Bits 00-11 These bits contain input values which range from 0 to 255 BCD (8 bit resolution).
Channel Address Codes
Bits
16 15 14
0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1
Channel Number
1 2 3 4 5 6 7 8
14165
Bits 12-13 These bits must remain reset (to 0) for proper operation.
Bits 14-16 These bits indicate by binary code which channel is being
read.
Bit 17 This bit indicates an overflow/underflow condition, and is set (to 1) under the following conditions:
input value is zero or negative input value is greater than or equal to 255
25
Chapter 2
Overview of the Analog Input Module

Specifications

Inputs
Per Module
8 singleended
Humidity Rating
5 to 95% (noncondensing)
Input Voltage Ranges (nominal)
1 to 5 V 0 to 5 V 0 to 10 V 10 to 10 V
Input Current Ranges (nominal)
0 to 20 mA 4 to 20 mA 20 to 20 mA
Input Overvoltage Protection
+
35 VDC
25 VRMS (sinusoidal)
Input Overcurrent Protection
+
30 mA
Input Impedance
10
10
Ohms
for voltage ranges
250 Ohms (+
0.1%) for current ranges
ElectricalOptical Isolation
between input circuit and control logic: 1500 V
Backplane Current Requirement
400 mA at 5 VDC
Keying (between)
4 and 6 26 and 28
A/D Converter T
ype
successive approximation, monotonic
Resolution
1 part in 256 (28)
Linearity
+
0.1% of full scale at 25o C
Offset
0.15% of full scale at 25o C
+
Gain
0.15% of full scale at 25o C
+
Quantizing Error
+
1/2 LSB (0.19% of full scale)
Absolute Accuracy (including linearity and gain at 25
o
C)
of full scale +
0.3%
1/2 LSB
Stability (drift over the full temperature range)
temperature coef
ficient = +
85 ppm/oC
of full scale
, offset,
26
Ambient T
emperature Rating
operating: 0 to 60 (32 to 140oF)
storage 40 to 85oC (40 to 185oF)
o
C
Inaccuracy (due to internal electrical noise)
3 sigma noise 0.2% RMS of full scale
Chapter
3
Installing the Analog Input Module

Chapter Objectives

Before You Install the Input Module

This chapter gives you information on:
choosing an external power supply wiring the input module’s field wiring arm keying a chassis slot for your module setting internal configuration switches installing the input module
The input module is shipped to you configured for block transfer operation. If you want to use single transfer, see Appendix C for proper switch settings.
Before installing your input module in the I/O chassis you should:
1. Calculate the power requirements of all modules in each chassis. See
“Power Requirements.”
2. Determine where to place the module in the I/O chassis. See
“Module Location in the I/O Chassis.”

Electrostatic Damage

3. Key the backplane connector in the I/O chassis. See “Keying.”
4. Make connections to the wiring arm. See “Wiring” and
“Grounding.”
5. Set configuration switches (only if you want single transfer, or to
change to the alternate input range).
Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins, or when you set configuration plugs or switches inside the module. Guard against electrostatic damage by observing the following precautions:
31
Chapter 3
Installing the Analog Input Module
Touch a grounded object to rid yourself of elctrostatic charge before
handling the module.
Handle the module from the front, away from the backplane connector.
Do not touch backplane connector pins.
When setting internal switches or configuration plugs, do not touch
semiconductor devices inside the module. Use a static-safe work station if available.
Keep the module in its static-shield bag when not in use.
CAUTION: Electrostatic discharge can degrade performance or cause permanent damage. Handle this module as stated above.

Power Requirements

Your module requires 400 mA from the I/O chassis backplane. Calculate the power usage of all modules in the I/O chassis so you do not exceed the power rating of the chassis backplane or the backplane power supply.
The input module also requires an external power supply exclusively for analog modules. Using a separate supply protects the analog signal from transients caused by the switching of digital circuits. The specifications for the external DC power supply are:
Specifications 5V 15V 15V
current
per input module
voltage tolerance
regulation (type)
line regulation (for 10 VAC RMS input change)
load regulation
150mA 70mA 70mA
1% 1% 1%
linear
(series or
shunt)
.02% .02% .02%
.04% .02% .02%
linear
(series or
shunt)
linear
(series or
shunt)
32
ripple
overvoltage protection
current limit (% of full load)
1 mV 1 mV 1 mV
7 V
125% 125% 125%
18 V
18 V
Chapter 3
Installing the Analog Input Module
We recommend either of two Allen-Bradley power supplies:
Power Supply (cat. no. 1770-P1) provides sufficient current for two 1771-IE input modules. This supply operates on either 120 or 220/240 VAC.
The Remote Power Supply (cat. no. 1778-P2) provides external power for up to ten 1771-IE input modules. Do not use this supply for I/O chassis power when powering analog modules. We recommend that you order one or two power cables (cat. no. 1771-CF), and connect no more than five 1771-IE input modules with a single power cable.
Power and common connections can be jumpered from one 1771-IE input module to the next. Be careful to minimize the voltage drop in your power connections.

Module Location

Keying

WARNING: Maintain at least 5.0 VDC between the 5 VDC terminal and common terminal measured at the wiring arm. A lower voltage could cause intermittent operation resulting in possible damage to equipment and personal injury.
Place your module in any I/O module slot except for the extreme left slot of the I/O chassis. This slot is reserved for PC processors or adapter modules. We recommend the following:
Do not put this input module in the same module group with a discrete
high density I/O module when using 2-slot addressing because this input module uses both the input and output image tables for block transfer. Two analog input modules, however, may be put in the same module group.
Group analog input modules away from AC or high voltage DC I/O
modules to minimize electrical noise interference.
Once you designate a slot for your input module, you should not place other types of modules in this slot. We recommend that you use the keying bands, shipped with your I/O chassis, to accept only one type of module in a designated I/O slot.
33
Chapter 3
Installing the Analog Input Module
To key a module slot to accept only the 1771-IE module, position the keying bands on the upper backplane connector at the following positions (Figure 3.1):
between 4 and 6 between 26 and 28
Figure 3.1
Positions
Keying
2 4 6 8 10 12
Keying Bands
14 16 18 20 22 24 26 28 30 32 34 36
14169

Wiring

34
Connect analog devices and external power to your input module through the Field Wiring Arm (cat. no. 1771-WB). The wiring arm pivots on the front of the I/O chassis to connect with the module. Wiring connections are made at the wiring arm, so you can remove the module from the chassis without disconnecting the wiring.
Connection diagram (Figure 3.2) shows connections of analog devices and power supply to the wiring arm of the input module.
The COMMON terminal on the wiring arm connects to the power supply COMMON and SIGNAL RETURN wires from each of your input devices (Figure 3.2). Do not confuse the SIGNAL RETURN wire with the cable shield. The SIGNAL RETURN is one of the insulated wires of the cable-twisted pair. The cable shield is discussed in the next section.
When wiring analog devices to the wiring arm, use Belden No. 8761 or an equivalent cable. We recommend that the cable from voltage mode input devices does not exceed 50 feet in length. We base this recommendation on considerations of noise immunity in typical industrial environments.
Chapter 3
Installing the Analog Input Module
There is no restriction on cable length for current mode input devices. Cable length resistance, however, when added to module input resistance, must not be enough to cause an overload on the analog driving device.
Figure 3.2 Connection
Diagram
(See application codes and laws.)
+5V
1
2
3
4
5
6
7
8
9
10
11
12
+5-15+15DC
Use power supply
Ground cable shield at one end only, preferably at chassis mounting bolt.
COMM
Analog
signal
source
Chassis ground mounting bolt
14168
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Supply Comm/ Sig. Rtn.
+15V
-15V
Field Wiring Arm
(Cat. No. 1771-WB)
If you use a 1770-P1 power supply for your external power source, you must jumper the 5 VDC COMMON and the 15 VDC COMMON terminals together either at the power supply or at the module. Figure 3.3 shows the wiring connections for the Power Supply (1770-P1).
35
Chapter 3
Installing the Analog Input Module
Figure 3.3
Supply Connections (cat. no. 1770P1)
Power
Jumper Positions
For 120V AC
- 15V DC
+ 15V DC
L1
+
15V DC Common
-
L2
+ 5V DC
+ 5V DC Common
Jumper Both Commons
14167
If you use the 1778-P2 remote power supply, connect it to the wiring arm using one or two power cables (Figure 3.4).
36
Figure 3.4
Supply Connections (cat. no. 1778P2)
Power
7
DC Common
+ 15V
- 15V
+ 5V
Field Wiring Arm for Analog Input Module
8
9
10
11
12
Red or Blue
Violet
Yellow
Black or Orange
Analog Power able (Cat. No. 1770CF)
Remote Power Supply (Cat. No. 1778P2)
Interlock
I/O
I/O
Wiring for power cable (cat. no. 1770CF is described in publication 17702.25)
14166
Chapter 3
Installing the Analog Input Module

Grounding

Ground the drain wire and shield of the Belden No. 8761 or equivalent cable (Figure 3.5) at one end of the cable only. Twist the drain wire and shield into a single strand. The best ground for this connection is an I/O chassis mounting bolt or stud.
Insulate the shield and drain wire at the other end of the cable using electrical tape.
You may mount a separate terminal near the input module for DC COMMON and SIGNAL RETURN wires. This terminal should be mounted as close to the module as possible to minimize the length of unshielded wire.
Refer to Wiring and Grounding Guidelines, publication 1770-4.1 for additional information.
Figure 3.5 Grounding
the Cable Shield
Ground Shield at I/O Chassis Mounting Bolt
Shield and Drain Twisted into Single Strnd
Field Wiring Arm
Belden No. 8761 or Equivalent Wire Cable
Refer to the connection diagram for eact twistedpair terminal connections.
17798
37
Chapter 3
Installing the Analog Input Module

Setting Configuration Switches

The module is set for block transfer operation andcalibrated at the factory for the voltage or current range that you ordered.
CAUTION: Electrostatic discharge can degrade performance or cause permanent damage to the module. Follow the guidelines on electrostatic discharge located at the beginning of this chapter before handling the module.
Transfer Mode
You should change the mode of operation to single transfer if your processor is one of the following:
PLC (now obsolete) Mini-PLC-2 (cat. no. 1772-LN1, -LN2)
Refer to Chapter 5, “Setting These Switches,” for setting the Transfer Mode switch to single transfer.

Installing the Input Module

Signal Mode
Without recalibrating, you can change the 1 to 5 VDC or the 0 to 5 VDC input voltage range to its corresponding 4 to 20 mA or 0 to 20 mA current range. Refer to Calibration, chapter 5, for the location of the signal mode switch assembly (Figure 5.1). Set all switches to the same setting as follows:
If your module is calibrated for one of these two voltage ranges and you want to change to the corresponding current range: set all switches ON.
If your module is calibrated for one of these two current ranges and you want to change to the corresponding voltage range: set all switches OFF.
Changing to any other input range requires that you recalibrate your module to obtain accurate operation.
Now that you have determined the power requirements, location, keying, wiring, and grounding for the input module, you are ready to install it in the chassis. Use the following procedure:
38
Chapter 3
Installing the Analog Input Module
1. Turn off power to the I/O chassis.
WARNING: Remove power from the 1771 I/O chassis backplane and wiring arm before removing or installing an I/O module.
Failure to remove power from the backplane could cause
injury or equipment damage due to possible unexpected operation.
Failure to remove power from the backplane or wiring arm
could cause module damage, degradation or performance, or injury.
2. Insert your module into the chassis. Plastic tracks on the top and
bottom of the slots guide the module into position. Do not force the module into the backplane connector, but apply firm even pressure.
3. Snap the I/O chassis latch over the module. This secures the module
in place.
4. Connect the wiring arm to the module.
5. Turn on power to the I/O chassis.
39
Chapter
4
Programming the Analog Input Module

Chapter Objectives

Block Transfer Programming

In this chapter we describe a general block transfer program, and present a programming example for each family of programmable controllers.
Program your processor to transfer data from the module to the processor’s data table using a block transfer read (BTR) instruction. We give you programming examples. Because every application is different, we urge you not to copy examples but to use the appropriate example as a guide.
Block transfer programming using the BTR instruction is covered in this chapter for most PLC-2 family processors, all PLC-3 family processors, and the PLC-5/15 processor. Other programs for transferring data are found as follows:
Processor Method Appendix
MiniPLC2
no. 1772LN3)
(cat. PLC2/20 (cat. no. 1772LP1, LP2)
Block T
ransfer,
Multiple GET
A

General Example

PLC (cat. no. 1774LB2, LC2)
We assume that you know how to enter ladder diagram programming via your programming terminal, how to enter instruction parameters, and how to map your data table or data files for proper data storage. If not, refer to the manuals that came with your processor. If necessary, refer to Publications Index, SD499, which lists all publications of the Industrial Computer Group.
We describe programming rungs in one general example applicable to most PLC-2 family processors (Figure 4.1). Although instruction formats are different, the program is also applicable to all PLC-3 family processors, and the PLC-5/15 processor. We also present an example for each processor family with specific addresses to show relationships
Single T
ransfer B
41
Chapter 4
Programming the Analog Input Module
between instructions. Do not copy these examples. They are for instructional purposes only.
Figure 4.1 Example
Rung 1
Rung 2
ReadOnly Block T
BTR
DN
ransfer Program
BLOCK XFER READ
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE:
FILE TO FILE MOVE
COUNTER ADDR: POSITION:
FILE LENGTH: FILE A:
FILE R: RATE PER SCAN:
EN
DN
EN
DN
PLC2 Family Example
42
Rung 1 This rung uses the BTR instruction to transfer data to the processor. It transfers data on alternate scans unless you condition it with instructions that enable it less often.
Rung 2 This rung moves transferred data to a storage location unless old data was not updated by a new transfer (BTR done bit not set).
Important: Each input word contains an overflow- underflow bit (bit 17) that your program should monitor to be sure the value is within range. The module sets this bit when it detects data at or beyond the limits of 0 and 255. We leave this programming logic to you because it is application dependent.
This example is written for the following conditions (Figure 4.2).
The module resides in rack 1, module group 2, slot 0 8-word block transfer
BTR data (control) address is 030 BTR file address is 050
FFM counter address is 043 FFM number of words moved is 8 FFM source file A is 050 FFM destination file R is 150 FFM rate per scan is 8
Chapter 4
Programming the Analog Input Module
Figure 4.2 Example
Rung 1
Rung 2
Rung 3
Program for PLC2 Family Processors (Local Chassis)
BLOCK XFER READ
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE:
BTR
DN
112
07
Use only when 1771-IE is in a local chassis and block transfers to this module are inhibited.
FILE TO FILE MOVE
COUNTER ADDR: POSITION: FILE LENGTH: FILE A:
FILE R: RATE PER SCAN:
030
120
050 - 057
043
050 - 057
150 - 157
08
000
08
08
012
EN
07
112
DN
07
043
EN
17
043
DN
15
012
IOT
Important: When your input module is in a local I/O chassis, random chance could allow block transfer requests to occur during module housekeeping and prevent block transfers. This condition is apparent when the done bit remains reset and no new data is transferred. If this condition should occur, we recommend that you add rung 3 to your program. It guards against the possibility of the processor repeatedly asking for a block transfer each time the module inhibits block transfers while updating its inputs.
43
Chapter 4
Programming the Analog Input Module
This rung adds up to 0.13ms to the processor scan time so use it sparingly. Locate it at the beginning of your ladder program. This logic is not required for PLC-2 family remote systems or for any other processor family.
PLC3 Family Example
This example is written for the following conditions (Figure 4.3).
The module resides in rack 1, module group 2, slot 0 8-word block transfer BTR control address is FB001:0000 BTR file address is FB002:0001
MVF source file A is FB002:0001 MVF destination file R is FB003:001 MVF counter address is C000l MVF number of words moved is 8 MVF rate per scan is all/scan
Figure 4.3 Example
Program for PLC3 Family Processors
WB001:0000
(DN)
15
BTR
BLOCK TRANSFER READ
RACK :
GROUP :
MODULE :
DATA :
LENGTH =
CNTL :
FB002:0001
FB001:0000
001
0=LOW
CNTL
LE
12
2
CNTL
DN 15
8
CNTL
ER 13
44
WB001:0000
(DN)
15
MVF
FILES FROM A TO R
A :
R :
COUNTER :
POS/LEN =
MODE=
FB002:0001
FB003:0001
ALL/SCAN
C0001
C0001
EN 12
C0001
DN
8
15
C0001
ER
13
Chapter 4
Programming the Analog Input Module
PLC5/15 Example
This example is written for the following conditions (Figure 4.4).
The module resides in rack 1, module group 2, slot 0 8-word block transfer BT Array (integer control address) is $N7:51 Data file (integer file address) is $N7:56
Figure 4.4 Example
Program for the PLC5/15 Processor
$N7:51
EN
BTR
BLOCK TRANSFER READ
RACK :
GROUP :
MODULE :
BT ARRAY
DATA FILE:
LENGTH:
CONTINUOUS
1
2
0
$N7:51
$N7:56
8
N
EN
15
DN
13
ER
12

Programming Considerations

Important: The PLC-5/15 processor buffers read block transfer data automatically, so program buffering is not required.
We suggest that you follow programming considerations applicable to your programmable controller. They are listed below and described in the manual that accompanied your controller.
PLC2 Family
Determine the first available block transfer address in the timer and
counter area of the data table. For PLC-2/20 and PLC-2/30 processors, it depends on the number of assigned remote I/O rack numbers.
Leave unused addresses following your last block transfer address for
future block transfer instructions.
Load zeros into the address following the last (reserved) block transfer
address to establish a boundary that prevents the processor from looking further for additional block transfer addresses.
Buffer incoming (BTR) data. Be sure it is valid before using it.
Examine the BTR done bit and any other status bit that monitors its validity.
45
Chapter 4
Programming the Analog Input Module
PLC3 Family
If your application requires many block transfer modules, distribute the
modules over as many I/O chassis as possible to optimize transfer time for the system as a whole.
Where allowed by your application, program block transfers to occur
less often than once per program scan.
Buffer incoming (BTR) data. Be sure it is valid before using it.
Examine the BTR done bit and any other status bit that monitors its validity.
PLC5/15
Incoming (BTR) data is buffered automatically by the processor.
46
Chapter
5
Calibrating the Analog Input Module

Chapter Objective

Service Information

Calibration Equipment

This chapter describes how you calibrate the module.
Your input module is calibrated at the factory. We recommend that you recalibrate it every year to maintain accuracy. If for some reason you can not calibrate the module, return it to Allen-Bradley Company for recalibration. The mailing address is:
Allen-Bradley Company Industrial Computer Group 747 Alpha Drive Highland Heights, Ohio 44143
We recommend the following equipment for calibrating the module:
Equipment: Description/Source:
precision source
digital voltmeter
sealant T
alignment tool
industrial terminal
voltage
+10V
, 0.1mV resolution minimum
Analog 3100, Data Precision 8200, or equivalent
5 1/2 digit, 0.01% accuracy minimum Keithley 191, Fluke 8300A, or equivalent
orque Seal" by Organic Products or equivalent
P/N 35F616, for potentiometer adjustment, Newark Electronics or equivalent
cat. no. 1770T3 with cable (cat. no. 1772TC) for PLC2 family processors cat. no. 1770T4 with cable (cat. no. 1775CAT) for PLC3 family processors cat. no. 1784T50 for PLC5/15 processors
51
Chapter 5
Calibrating the Analog Input Module

Before You Calibrate

Before you calibrate, follow these steps:
1. Turn OFF power to the I/O chassis backplane and to your wiring
arm.
WARNING: Remove power from the 1771 I/O backplane and wiring arm before removing or installing an I/O module.
Failure to remove power from the backplane could cause
injury or equipment damage due to unexpected operation.
Failure to remove power from the backplane or wiring arm
could cause module damage, degradation of performance, or injury.
2. Disconnect all analog signal inputs from the module’s wiring arm
(leave 5V, +
15V DC, and COMMON connections attached). Label
the inputs to aid you in reconnection.

Calibrating the Input Module

3. Remove the module from the chassis by pivoting the wiring arm
down and releasing the plastic lever at the top of the module. Pull the module straight out from the slot.
CAUTION: Electrostatic discharge can degrade performance or cause permanent damage. Refer to the guidelines at the beginning of chapter 3.
4. Remove screws from the four corners of each cover plate and
remove the covers. This gives you access to internal switch assemblies.
Connect your industrial terminal to your processor so you can display channel input values in BCD during calibration. Be sure your processor is programmed to block transfer data from the module. For safety purposes, disable all outputs or disable your ladder program except for transferring data from the module you are calibrating.
52
To calibrate the module, you
set internal switches adjust the offset (Part A) adjust the offset (Part B) calibrate the gain
Chapter 5
Calibrating the Analog Input Module

Setting the Switches

There are three sets of switch assemblies (Figure 5.1) in the module:
Range Select Signal Mode Transfer Mode
Figure 5.1 Location
of Switch Assemblies
Transfer
Mode
Range Select
Signal Mode
14162
53
Chapter 5
Calibrating the Analog Input Module
Set these switches as follows:
1. Range Select switch assembly lets you select a current or voltage
input range by setting switches 1-10. These switch settings remain the same during and after calibration.
Change these switch settings only if you want to change to another voltage or current input range group.
Range: Switch
1 2 3 4 5 6 7 8 9 10
1 to 5V 4 to 20 mA
0 to 5V 0 to 20 mA
0 to 10V
+10V ON ON OFF OFF ON OFF ON OFF ON OFF
+20mA ON ON OFF OFF ON OFF ON ON OFF OFF
OFF OFF
ON ON
ON ON OFF OFF ON ON OFF ON OFF OFF
OFF OFF
ON ON
ON ON
OFF OFF
ON ON
OFF OFF
OFF OFF
ON ON
Number
ON ON
ON ON
OFF OFF
OFF OFF
ON ON
ON ON
OFF OFF
OFF OFF
OFF OFF
ON ON
2. Signal Mode switch assembly lets you select current mode (all
switches are ON) or voltage mode (all switches are OFF).
CAUTION: Be sure external power (15, 5 VDC) is OFF before changing the signal mode switch.
Set all eight switches to OFF (voltage mode) during calibration.

Offset (Part A)

54
3. Transfer Mode switch assembly lets you select single transfer (switch
1 ON) or block transfer (switch 1 OFF).
Change the setting of switch 2 to ON only for the Offset (Part A) procedure.
This procedure applies only if your input range is (1 to 5 VDC) or (4 to 20 mA).
Important: If the input range of your module is other than a range of (1 to 5 VDC) or (4 to 20 mA), skip this procedure and go directly to Offset (Part B).
Chapter 5
Calibrating the Analog Input Module
Make this adjustment for channel 1, only.
1. Set switch number 2 ON of the transfer mode switch assembly.
2. Place the module back in its I/O slot, and connect the wiring arm.
3. Change the processor mode select switch to test or program mode.
Turn on power to the processor, I/O chassis, and external power supply to the module.
4. Connect the precision voltage source:
positive lead to input channel 1
negative lead to DC COMMON of the wiring arm
5. Turn on the precision voltage source and set it to 1.0000 Vdc.
6. Connect the DVM leads to the test points on the front of the module,
positive lead to the red test point, negative lead to the black test point.
7. Read the voltage at the test points. It must be 0.0000 0.2 mV. If not,
adjust potentiometer #1 on the front of the module (Figure 5.2).
55
Chapter 5
Calibrating the Analog Input Module
Figure 5.2 Location
of Potentiometers and T
est Points
Potentiometer #1
Potentiometer #2
Potentiometer #3
Red Test Point
Black Test Point
14163

Offset (Part B)

8. Seal the setting with a drop of sealant.
9. Turn off power to the external power supply, I/O chassis, and
processor.
10. Remove the module from the I/O chassis.
11. Reset switch number 2 OFF of the transfer mode switch assembly.
12. After replacing the covers, place the module back in its slot in the
I/O chassis.
Start your calibration procedure here if your input range is NOT (1 to 5 VDC) or (4 to 20 mA).
You make one adjustment for all channels at the same time for offset, then one adjustment for gain calibration.
56
Chapter 5
Calibrating the Analog Input Module
1. Jumper all 8 input terminals together at the wiring arm.
2. Connect the precision voltage source to the jumpered input terminals
and to ground.
3. Set the precision voltage source to the input value required for
minimum output for your particular input range. Remember that you set the module to operate in voltage mode for calibration.
Range Input
1 to 5 V
0 to 5 V
10 to 10 V
0 to 10 V
for Minimum Output
1.0078 V
0.0098 V
9.9609 V
0.0195 V
4. Observe the BCD value. It should toggle between 000 and 001 for
equal lengths of time. If not, adjust potentiometer #2.
Do not seal the potentiometer until you have finished adjusting the gain.
Gain
5. Set the precision voltage source to the input value required for
maximum output for your particular input range. Remember that you set the module to
Range Input
1 to 5 V
0 to 5 V
10 to 10 V
0 to 10 V
for Maximum Output
4.9766 V
4.9707 V
9.8828 V
9.9414 V
6. Observe the BCD value. It should toggle between 254 and 255 for
equal lengths of time. If not, adjust potentiometer #3.
7. Recheck offset and gain to be sure that they are properly set. Adjust
if necessary.
8. Seal the potentiometers.
57
Chapter 5
Calibrating the Analog Input Module
9. If your input range was a current range, reset the signal mode switch
assembly to current mode (all switches on).
10. Re-install and test the module with known values before operating
with I/O devices.
58
Appendix
A
Block Transfer (Multiple GET) for PLC2/20

Example Program

Assumptions

This read-only program (Figure A.1) transfers a block of input data from the analog input module to a momentary storage (buffer) in the processor’s data table. If valid, input data is moved elsewhere in the data table for use by your ladder program. If invalid, it is written over by the next block transfer. This program performs the same function as the 2-rung program described in chapter 4.
Important: If you place your input module in a local chassis, we recommend that you add the same rung as described in the PLC-2 family example (Figure 4.2, Rung 3). This rung guards against the possibility of the processor repeatedly asking for a block transfer when the module momentarily inhibits block transfers while updating its inputs.
The example program is based on the following assumptions:
module in rack 1, module group 2, slot 0 8-word block transfer block transfer (control) address 030 read block transfer (buffer) file 050-057 storage file 150-157
A1
Appendix A
Block Transfer (Multiple GET) for PLC-2/20
Figure A.1 Example
Rung 1
Rung 2
Rung 3
Rung 4
Rung 5
Rung 6
Rung 7
Rung 8
Rung 9
Rung 10
Rung 11
Rung 12
Rung 13
Rung 14
Rung 15
Rung 16
Rung 17
Rung 18
Program for PLC2/20
Ladder Diagram Dump
02000 11207
Block Length
030 130
GG
120
050
01207
02002
02002
02002
02002
02002
02002
02002
02002
050
G
000
1
050
G PUT
000
051
G PUT
000
052
G PUT
000
053
G PUT
000
054
G PUT
000
055
G PUT
000
056
G PUT
000
057
G PUT 000 052
051
G
G
000
000
2345
Start
Clears Block Transfer Flag
Block Transfer
Block Transfer Flag
Moves Data
053
054
055
G
G
G
000
000
000
678
056
G
000
057
G
000
02002
02000
U
01200
U
01201
U
01202
U
01203
L
01204
U
01205
U
01207
02000
L
ON
150
1
000
151
2
000
152
3
000
153
4
000
154
5
000
155
6
000
156
7
000
157
8
000
Display Only
A2
Appendix A
Block Transfer (Multiple GET) for PLC-2/20

Description

Scan 1
Rung 9
This rung controls block transfer. Preconditions are optional. The first available word 030 in the timer/counter accumulated area stores module location 120. Word 130 in the timer/counter preset area stores the address of the first word in the BTR (buffer) file.
Output bit 01207 initiates block transfer. The first digit of this output address is zero, because it is in the output image table. The next three digits are the module’s location: rack, module group, and slot numbers. The last digit, 7, is the BTR enable bit (bit 17 if the module was in slot 1).
Rung 10
Bit 01207 is examined to determine if a block transfer was initiated. If initiated, Bit 02000 is latched until the next program scan.
Scan 2
Rung 1
This rung detects the request (02000) and completion (11207) of a block transfer to this module. Upon completion, it lets transferred data move to storage location words 150-157 in rungs 11-17.
Rung 2
This rung resets the block transfer operation. Bit 02000 is unlatched. It will be latched again if a block transfer request is made this program scan.
Rungs 3  7
These rungs determine the block length by setting a binary code equal to the number of words transferred.
A3
Appendix A
Block Transfer (Multiple GET) for PLC-2/20
Rungs 11  18
These rungs move data from the BTR read file to storage. When the block transfer one-shot (02002) is set, data in each (buffer) word address 050-057 is moved to storage location 150-157 where it can be used by your ladder program. If data is not moved, it is written over by the next block transfer.
Important: Each input word contains an overflow- underflow bit (bit 17) that your program should monitor to be sure the value stored in that word is within range. The module sets this bit when it detects data at or beyond the limits of 0 and 255. We leave this programming logic to you because it is application dependent.
Last Rung
These GET instructions display the BCD value of each transferred word, and are for display only.
A4
Appendix
B
Single Channel Transfer for PLC Processors

Example Program

Programming techniques used in this example program (Figure B.1) for the PLC processor include:
I/O scan counter conditional ignore zone
I/O Scan Counter
The I/O scan counter (rungs 1-3) controls the transfer sequence and gives the module sufficient time to respond to channel byte and update select commands.
The scan counter increments only when a program scan and I/O scan have occurred. It does this by manipulating a specially chosen bit. The bit must be in the input image table, and must have an input module associated with it. The terminal corresponding to this bit must NOT have an input device wired to it so it can be turned OFF each I/O scan. Choose a bit which satisfies these conditions:
It has an input address with the same assigned rack number as the input
module.
The input terminal associated with that bit address should be in a
module group with a higher module group number than the one the input module is in.
The input terminal associated with that bit address must be unused.
Wire it to DC COMMON or L2 (AC Low) to guard against wiring it to an input device.
Conditional Ignore Zone
The conditional ignore zone controls multiple output instructions based on a set of overriding conditions. When these conditions are true, the outputs within the zone are controlled by the conditions in their individual rungs. When false, the zone outputs are held in their last state, whether ON or OFF.
B1
Appendix B
Single Channel Transfer for PLC Processor
The rungs within the conditional ignore zone (rungs 6-25) reconstruct and store the 16-bit input word from each channel. The override condition of the zone must be true (I/O scan counter accumulated value = 007) for the state of any output within the zone to be changed.
B2
Appendix B
Single Channel Transfer for PLC Processor
Figure B.1 Example
Rung No.
Program for the PLC Processor
02200 11111
1
20017
2
3
200
365
005
365
005
367
007
110
=
G
000
=
=
4
G
000
200
5
G
000
200
6
G
000
200
7
G
000
25100 25010
8
200
CTU
PR 007 AC 000
11111
20017
250 PUT
000
01007
L
37710
251 PUT 000
L
/
L
Scan counter
Store low byte
Latch high byte select
Begin condiional ignore zone
Store high byte
25101 25011
9
25102 25012
10
25103 25013
11
25104 25014
12
25105 25015
13
25106 25016
14
25107 25017
15
25017 25016 25015 25014
16
250
G
000
360
=
000
02002
Reconstruct channel upper byte bit-by-bit
Fault diagnostic rung
B3
Appendix B
Single Channel Transfer for PLC Processor
22
23
24
25
26
27
28
29
30
31
B4
02002 250
17
18
19
20
21
01000 01001 01002 01003 01004 01005 01006
02002 01000
02002 01001
02002 01002
02002 01003
02002 01004
02002 01005
02002 01006
200
G 000 200
G 000
200
G 000 203
G 000 200
G 000
203
G 000 200
G 000
203
G
000
367
007 367
007
367
007 361
001 363
003
362
002 363
003 363
003
250
G
000
250
G 000 250
G 000
250
G 000
250
G 000
250
G 000
250
G
000
=
=
363
=
G
002
=
<
=
<
=
G
000
260 PUT
000 261
PUT
000
262 PUT
000 263
PUT
000 264
PUT
000 265
PUT
000 266
PUT
000 267
PUT
000
37710
U
01007
U
203
CTU
PR =008 AC = 000
200
PUT
000
01000
01001
01002
Channel No.
1
2
3
4
Store channel values
5
6
7
8
End conditional ignore zone
Unlatch byte select
Increment reference counter
Load Scan Counter with 002
Update SELECT Bits
Channel SELECT Bits
32
33
34
35
36
203
G
000
203
G
000
203
G
000
203
G
000
203
G
000
02200
364
=
004
365
005
366
006
367
007
370
008
Appendix B
Single Channel Transfer for PLC Processor
Channel SELECT
01003
=
=
=
=
01004
01005
01006
200
CTR
Bits
Reset Counters
37
38
203
G
000
260
G
000
370
008 261
G
000
=
262
263
264
265
266
267
G
G
G
G
G
G
END 0400
000
000
000
000
000
000
203
CTR
Display Rung
B5
Appendix B
Single Channel Transfer for PLC Processor

Program Logic

Rung
No.
1-3
29 30
Start
Increment I/O scan counter
(200)
Is
Scan count
<3?
No
Is Yes
Scan count
= 3?
No
In single channel transfer, the processor transfers data one byte at a time. Your program must reconstruct the data into 16-bit words in the correct sequence. We developed a flow chart (Figure B.2) that describes single transfer programming to help you understand the logic.
Figure B.2
Chart for PLC Example Program
Flow
Yes
1. Store input word (110) containing high byte.
2. Reconstruct channel word.
3. Check Module fault diagnostics.
4. Store channel word.
5. Reset Byte SELECT bit.
6. Increment Reference Counter (203).
7. Load Scan Counter (200) with 002.
Yes Set Update
SELECT bits
Reset Update
SELECT bits. Set
Channel No. 1
SELECT
command.
(Bits 0-6 of output
byte OFF.)
Is
Scan count
= 7?
No
Set Channel SELECT bits
Rung
No.
6
7
8-15
16
17-24
26
27
28
29-35
B6
Is No
Scan count
= 5?
4
5
Yes
Store input word (110) containing
low byte
Set Byte SELECT bit to 1. (Selects High Byte.)
Have
all Module
Channels been
Read?
(Does CTU 203
= 8?)
No
To balance of program
Yes
Reset both scan
and reference
counters (200
and 203)
36, 37
14161
Appendix B
Single Channel Transfer for PLC Processor

Assumptions

Using Less Than Eight Input Channels

The example program is based on the following assumptions:
The input module is in slot 0 of module group 0 in rack 1.
All eight channels are used. If fewer channels are used, rungs may be
eliminated.
The following data table addresses are used to store values:
- words 250-251 serve as momentary storage
- words 260-267 store input channel values
- words 360-370 store constants 000-008
Often fewer than eight input channels are connected to the module. If using fewer than eight inputs, omit channels in reverse order. Omit channel 8 first, channel 7 second, etc, when connecting analog devices and when programming.
You can shorten the program to conserve memory and decrease program scan time. To reduce program size, study the sequence of events used to update module data and to read the data from each channel. Reduce the program as follows:
Omit channel select bit instructions starting with 10116, 01005, etc.
(rung 17).
Omit rungs that store channel values starting with rung 24, rung 23, etc.
Reduce the byte select comparison value in word 367 (rung 26).
Reduce the preset of the increment reference counter (rung 27).
Program channel select bits only for those channels you are using.
Omit rung 35 for channel 8, rung 34 for channel 7, etc.
Reset counters to the number of channels used by reducing the
comparison value stored in word 370 (rungs 36 and 37) accordingly.
Reduce the number of GET instructions in the display rung (rung 38).
B7

Index

A
audience, 11
C
Calibration equipment, 51
Calibration procedure, 52
gain, 57 offset (part A), 54 offset (part B), 56
Communication, module to processor, 23
configuraion switches, 38
Connection Diagram, 35
E
Electrostatic Damage, 31
G
Grounding, 37
L
Location of module, 33
Location of potentiometers, 56
Location of switch assemblies, 53
P
Power requirements, 32
Power supply connections, 36
Programming block transfer, 41
general example, 41 PLC-2 family example, 42 PLC-2/20 (using multiple GET), A1 PLC-3 family example, 44 PLC-5/15 example, 45
Programming considerations, 45
S
Service information, 51
Specifications, 26
Switch assemblies, 53
I
Input channels, 22
Input Data Format, 24
K
Keying, 33
W
Wiring, 34
AllenBradley ductivity and quality for more than 90 years. W
, a Rockwell Automation Business, has been helping its customers improve pro
e design, manufacture and support a broad range of automation products worldwide. They include logic processors, power and motion control devices, operator interfaces, sensors and a variety of software. Rockwell is one of the worlds leading technology companies.
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• Yugoslavia
el: (1) 414 3822000 Fax: (1) 414 3824444
Publication 1771-6.5.7 - December, 1986 Supersedes 1771-810 - February
Publication 1771-6.5.7 - December, 1986
, 1981
Copyright
1986 AllenBradley Company
PN 955100-45
, Inc. Printed in USA
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