Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 66)

Appendix A
Specifications
A–2
Use the following steps to determine the maximum throughput time in your
application.
1. Determine and record the PLC and SLC delay by following these
instructions:
I/O circuit delay:
I/O scan time:
PLC SLC
Program scan time:
PLC Delay:
+
+
SLC Delay: =
+
+
=
2. Record the remote I/O delay:
Remote I/O delay:
3. Record the DCM delay. This should be <10 msec.:
DCM delay:
4. Using your recorded values above, determine the maximum throughput
time for your application as shown below:
DCM delay:
PLC Delay:
+
Remote I/O delay:
SLC Delay:
=
+
+
Maximum throughput time:
Throughput Timing