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

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

Table of Contents

Using This Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Objective
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Publications
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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
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Family Example Family Example
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41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contentsii
Calibrating the Analog Input Module 51. . . . . . . . . . . . . . . . .
Objective
Information
Equipment
the Input Module
the Switches
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51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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52. . . . . . . . . . . . . . . . . . . . . . . . . . . .
53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer (Multiple GET) for PLC2/20 A1. . . . . . . . . . . .
Example Program A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assumptions A1 Description A3
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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.
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