Delta AH500 Manual page 655

The settings in the above three figures affect the output result of DO and AO modules as
follows.
Fail-Safe Behavior
Slave receives zero
data in Clear Mode
Slave receives no
data in Clear Mode
IO module error
Stop I/O exchange
& report fault
Continue & report
fault
Loss comm with
master
I/O module stops
running
I/O module
continues running
Chapter 14 Remote I/O Communication Module AHRTU-PFBS
Master in Clear
mode
I/O module
continues running
I/O module stops
running
I/O module
continues running
I/O module stops
running
Output hold
DO and AO are
disable
DO and AO are
enable
DO and AO are
disable
DO and AO are
enable
Output hold
DO and AO are
disable
DO and AO are
enable
DO and AO are
disable
DO and AO are
enable
Output hold Output result
DO and AO are
disable
DO and AO are
enable
DO and AO are
disable
DO and AO are
enable
DO and AO are
disable
DO and AO are
enable
DO and AO are
disable
DO and AO are
enable
Output result
cleared
held.
held.
held.
Output result
cleared.
held.
held.
held.
cleared.
held.
cleared.
held.
held.
held.
cleared.
held.
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