Delta AH500 - Page 655

Chapter 14 Remote I/O Communication Module AHRTU-PFBS
14-25
The settings in the above three figures affect the output result of DO and AO modules as
follows.
Fail-Safe Behavior
Master in Clear
mode
Output hold Output result
Slave receives zero
data in Clear Mode
I/O module
continues running
disable
DO and AO are
cleared.
enable
DO and AO are
held.
I/O module stops
running
disable
DO and AO are
cleared.
enable
DO and AO are
held.
Slave receives no
data in Clear Mode
I/O module
continues running
disable
DO and AO are
held.
enable
DO and AO are
held.
I/O module stops
running
disable
DO and AO are
cleared.
enable
DO and AO are
held.
IO module error Output hold Output result
Stop I/O exchange
& report fault
disable
DO and AO are
cleared
enable
DO and AO are
held.
Continue & report
fault
disable
DO and AO are
held.
enable
DO and AO are
held.
Loss comm with
master
Output hold Output result
I/O module stops
running
disable
DO and AO are
cleared.
enable
DO and AO are
held.
I/O module
continues running
disable
DO and AO are
held.
enable
DO and AO are
held.