Appendices
A - 10
CJ-series EtherCAT Slave Units Operation Manual (W541)
Use the following program example as a guide to detect that the CJ-series CPU Unit with a mounted
EtherCAT Slave Unit enters PROGRAM mode. In the following example, an NJ-series CPU Unit’s
built-in EtherCAT port is used as the EtherCAT master.
This program example uses the following items.
A-3-2 Program Example for the EtherCAT Master
Item Description
_EC_PDSlavTbl[1] System-defined variable for the NJ-series CPU Unit to indicate that the
EtherCAT slave (node 01) is performing process data communications.
E001_Input001[0] Device variable assigned to the EtherCAT Slave Unit.
E001_Output001[0]
WatchDogBit Internal variable to reset the accumulation timer when E001_Input001[0]
changes state.
AccumulationTimer
instruction
Instruction that checks for a stop in bit toggling for a preset time amount that
will occur when the CJ-series CPU Unit with a mounted EtherCAT Slave Unit
enters PROGRAM mode. Refer to Timing Considerations on page A-9.
SetAlarm instruction Instruction that creates a user-defined error when the CJ-series CPU Unit
with a mounted EtherCAT Slave Unit enters PROGRAM mode.
ECAT_Slave_PRG_Mode External variable to indicate that the CJ-series CPU Unit with a mounted
EtherCAT Slave Unit has entered PROGRAM mode.
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