
Appendix A
Master / Slave Example
A–15
PLC Master / Slave Example
Step 4: Start the Network
RUN
TERM
STOP
PWR
RUN
CPU
BATT
I/O
COM
CPU/POWER 110/220VAC
Only the master station needs to be in Run
mode to execute the communications
program. However, for this example to work
correctly all CPUs should be in Run mode.
You can use the programming devices to
place them in Run mode,or you just turn the
keyswitch to the RUN position.
Switch the PLCs to
Run Mode
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