Omron CJ1W-ECT21 Operation Manual page 78

3 Data Exchange with the CPU Unit
The following device variables for CJ-series Unit are used to reference individual information.
Name of device variables
for CJ-series Unit
*_AvailableMailbox
*_InDataValid
3 - 16
Type R/W Name
BOOL R Available
Mailbox
Communica-
tion
BOOL R Input Data
Valid
CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)
Function
TRUE:
Indicates that mailbox communication is available
for the Unit.
FALSE:
Indicates that mailbox communication is not avail-
able for the Unit.
Default: FALSE
This variable will remain TRUE while the Unit is in
Pre-Operational, Safe-Operational or Operational
state.
This variable will also remain TRUE if the IN port
link is not established with another device.
TRUE:
Indicates that the Unit is processing transmit by
process data communication. Data is valid and
usable for control.
FALSE:
Indicates that the Unit is not processing transmit by
process data communication. Data is invalid and
unusable for control.
Default: FALSE
This variable will remain TRUE while the Unit is in
Safe-Operational state or Operational state.
This variable will also remain TRUE if the IN port
link is not established with another device. Refer to
A-2 Programming Example to Detect Valid I/O Pro-
cess Data on page A-11.