KEYENCE SR-750 Series - Manual (Page 91)

91 E SR-750 UM
9-5
PLC Link Error
This section describes how to handle a communication error when it occurs during
PLC link.
„ Operation when a PLC link error occurs
When a PLC link error occurs, the SR-750 Series exhibits the following behavior:
• "E7" is displayed on the multiple LED indicator.
• When ERR BUSY is set to the output terminal, the set output terminal turns on.
Since the operation is stopped during this period, no timing input signal is
accepted.
„ Check points
When an error occurs, check the following points:
• Check that the cable between SR-750 Series and PLC is correctly connected.
• Check that the correct communication cable, including wiring, is used. Check for
breaks.
• Is the SR-750 Series correctly set to the PLC link?
• Was the PLC to be connected turned on again after setting is complete?
• Is the PLC configuration correct?
• Is the address configuration for each control within the range of use of the PLC?
• Are the devices specified for each control address within the range of use of the
SR-750 Series?
„ Procedure for PLC link error recovery
Use the following procedure to clear the PLC link error of the SR-750 Series and
resume communication.
• Turn the SR-750 Series back on.
• Hold the TEST button on the SR-750 Series for 3 seconds.
• When Clear PLC link error is set to the IN terminal, turn on the IN terminal.
• Send the Clear PLC link error command (PCLR) from the command
communication port.
• Send the Reset command (RESET) from the command communication port.
When the PLC link error is cleared, data stored in the send buffer will be cleared.
If the problem persists despite the above action, contact your nearest KEYENCE
sales office.