Chapter 6
Ladder Programming Examples
6–5
When executing a dynamic channel configuration change, there will always
be a delay from the time the ladder program makes the change to the time the
RTD module gives you a data word using that new configuration
information. Therefore, it is very important to verify that a dynamic channel
configuration change took effect in the RTD module, particularly if the
channel being dynamically configured is used for control. Figure 6.6,
explains how to verify that channel configuration changes have taken effect.
Example – Execute a dynamic configuration change to channel 2 of the
RTD module located in slot 3 of a 1746 chassis, and set an internal “data
valid” bit when the new configuration has taken effect.
Figure 6.6
Program To Verify Configuration Word Data Changes
] [
COP
COPY FILE
Source
#N10:0
Dest
#O:3.0
Length
4
S:1
15
Set up all four channels.
Rung 2:0
Set channel 2 to display in
°
C.
] [
0
Rung 2:1
B3
0
I:1.0
[OSR]
MOVE
Source
N10:4
Dest
O:3.2
MOV
Rung 2:2
B3
1
MOVE
Source
N10:2
Dest
O:3.2
MOV
0
I:1.0
[OSR]
Set channel 2 back to display in
°
F.
]/[
Rung 2:3
MASKED MOVE
Source
I:3.6
Mask
9FFF
Dest
N7:0
MVM
BITWISE EXCLUS OR
Source A
N7:0
Mask
O:3.2
Dest
N7:1
XOR
Verifying Channel
Configuration Changes
Summary of Contents for SLC 500 1746-NR4
Page 1: ...User Manual SLC 500t RTD Resistance Input Module Cat No 1746 NR4 Allen Bradley AB Spares ...
Page 15: ...Preface P 8 Notes AB Spares ...
Page 37: ...Chapter 2 Quick Start 2 12 Notes AB Spares ...
Page 63: ...Chapter 4 Preliminary Operating Considerations 4 12 Notes AB Spares ...
Page 87: ...Chapter 5 Channel Configuration Data and Status 5 24 Notes AB Spares ...
Page 107: ...Chapter 7 Module Diagnostics and Troubleshooting 7 8 Notes AB Spares ...
Page 117: ...Chapter 8 Application Examples 8 10 Notes AB Spares ...
Page 123: ...Appendix A Specifications A 6 Notes AB Spares ...
Page 125: ...Appendix B RTD Standards B 2 Notes AB Spares ...
