Communication via CC-Link
Fault reaction on communication errors
HOLD / CLR-
If the communication via CC-Link breaks down (e.g. PLC cpu goes into
fault, CC-Link cable is disconnected) the reaction of the drive can be
programmed depending on your application.
This is selectable by communication board parameter P712 bit 0
P712 bit 0 = 1: CLR function
When communication breaks down CBL detects the fault. CBL reacts
by sending setpoint 0000 and neutral control bits to the converter. The
Remark: Set P722 (Telegram failure time) to 0000.
P712 bit 0 = 0: HOLD function
When communication breaks down CBL detects the fault. CBL don't
react. It gives no further information (telegrams) to the converter. Actual
control bits and setpoint are further valid. Drive is still running. Now you
can handle the fault reaction by the fault mechanism of the converter.
With converter parameter P722 (Telegram failure time) you can
supervise the setpoint channel from the communication board. If there
is no new telegram from CBL at the setpoint channel in the time interval
parameterized in P722, the fault mechanism of the converter starts;
refer to documentation of converter.