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10
After you complete and check the two data link installations, apply power
to the system by performing the following steps. This sequence is
necessary to properly establish communication between the processor and
industrial terminal.
Step 1 – Energize the two line driver/receiver power supplies associated
with the PLC-2 family processor.
Step 2 – Energize the two line driver/receiver power supplies associated
with the industrial terminal.
Step 3 – Energize the industrial terminal.
Power has now been applied and communication between the PLC-2
family processor and the industrial terminal has been established.
Remove power from the system by performing the following steps in the
order given:
Step 1 – De-energize the industrial terminal.
You can perform steps 2 and 3 simultaneously.
Step 2 – De-energize the two line driver/receiver power supplies
associated with the industrial terminal.
Step 3 – De-energize the two line driver/receiver power supplies
associated with the PLC-2 family processor.
Figures 4, 7,
8
and
9
provide hardware information required to
troubleshoot the data link. Replaceable parts are listed under "Materials
Required."
Analyze any installation and down-time troubles using the following check
list:
1.
Check that wiring agrees with figures 7, 8, and 9.
2.
Check that 1770-CW1 and 1770-CW2 cables are connected to the
correct modules at both ends of the link.
3.
Check that all line driver/receiver modules are firmly seated in their
receptacles.
4.
Check that all cable connectors are firmly seated.
5.
Check that power supplies are receiving primary input power.
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