Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 4)

Publication 1762-UM003A-EN-P - February 2003
2 Table of Contents
Chapter 3
Module Data, Status, and Channel
Configuration Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Input Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . 3-2
Input Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
General Status Flag Bits (S0 to S3) . . . . . . . . . . . . . . . . 3-3
Open-Circuit Flag Bits (OC0 to OC3) . . . . . . . . . . . . . . 3-4
Over-Range Flag Bits (O0 to O3) . . . . . . . . . . . . . . . . . 3-5
Under-Range Flag Bits (U0 to U3). . . . . . . . . . . . . . . . . 3-5
Configuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Enabling or Disabling a Channel (Bit 15) . . . . . . . . . . . 3-9
Selecting Data Format (Bits 12 to 14) . . . . . . . . . . . . . . 3-9
Selecting Input/Sensor Type (Bits 8 to 11) . . . . . . . . . . 3-14
Selecting Temperature Units/Mode (Bit 7). . . . . . . . . . . 3-15
Selecting Open-Circuit Response (Bits 5 and 6) . . . . . . . 3-15
Selecting Cyclic Lead Compensation (Bit 4). . . . . . . . . . 3-16
Selecting Excitation Current (Bit 3) . . . . . . . . . . . . . . . . 3-16
Setting Filter Frequency (Bits 0 to 2) . . . . . . . . . . . . . . . 3-16
Selecting Enable/Disable Cyclic Autocalibration
(Word 4, Bit 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Determining Effective Resolution and Range . . . . . . . . . . . 3-20
Determining Module Update Time . . . . . . . . . . . . . . . . . . . 3-27
Effects of Autocalibration on Module Update Time . . . . 3-28
Calculating Module Update Time with Autocalibration
Enabled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
Effects of Cyclic Lead Wire Compensation on
Module Update Time . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Calculating Module Update Time with Cyclic Lead Wire
Compensation Enabled . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Impact of Autocalibration and Lead Wire Compensation
on Module Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Effects of Autocalibration on Accuracy . . . . . . . . . . . . . . . . 3-33
Chapter 4
Diagnostics and Troubleshooting Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Activating Devices When Troubleshooting . . . . . . . . . . 4-2
Stand Clear of the Equipment . . . . . . . . . . . . . . . . . . . . 4-2
Program Alteration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Module Operation vs. Channel Operation . . . . . . . . . . . . . 4-2