User guide

Hardware

890 USE 108 00 August 2001

PLC Interrupt

Connection

One two-position connection is located on the front of the CPU. It is used to connect

to the 470 GPS 001 00 Receiver for the time synchronization of the PLCs TOD

clock.(See Time Synchronization of the TOD (E984-258/265/275/285 Only), p. 22.)

LED Indicators The following table shows the LED indicators and their purpose.

LED Indicator Meaning

Ready (green) Controller has passed power-up diagnostics- LED is ON in

unconfigured, stopped, and start states as long as health status is

valid; is OFF if error condition detected by diagnostics.

Run (green) Controller has started and is solving logic. (See LED Error Codes,

p. 211 for the RUN LED error codes.)

Battery Low (red) Battery needs replacing-10 day hold-up from initial indication

Modbus 1 (green) Communications are active on the Modbus port 1

PC (green) PCMCIA card can be swapped when on. (See Program Storage

using FLASH RAM & PCMCIA (E984-258/265/275/285 Only), p. 44

for more information about LED status.

Modbus Plus (green) For details about Modbus Plus LED, see Modbus Plus LEDs, p. 86

and LED Error Codes, p. 211.