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Remote I/O Allocations Section 4-3
• Example: Monitoring NE1A-series Controller Safety I/O Communications
Error and Status Flags from the PLC (when d5 and d6 Errors Occur)
Example: Monitoring NE1A-series Run Status and Normal Status Flags from the PLC
Note Be careful when monitoring general status from a Standard PLC, because all
bits are regarded as OFF from the PLC ladder program before communica-
tions are established or while a communications error is in effect.
Example: Monitoring NE1A-series Run Status Flags from the PLC
Bit 4
Bit 5
Controller mode
change
Communications
established at all
Safety Master
connections.
Communications
established at all
Safety Slave
connections.
Safety Master
communications
error occurs.
Error
cleared
Safety Slave
communications
error occurs.
Error
cleared
Bit 4
Bit 5
Controller
mode change
d5 error at Safety
Master
connection
d6 error at
Safety Master
connection
Communications
established at
Safety Master
connection where
d6 error occurred.
Communications
established at all
Safety Master
connections.
Bit 6
Bit 7
Controller error
occurs
Error
cleared
Controller
mode
change
Controller
error
occurs
Error
cleared
Error remains in
effect
Idle to RUN
Error remains
in effect
Bit 6
Standard I/O
communications
error
Controller
mode change
Standard I/O
communications error
Error cleared
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