Chapter 14 Remote I/O Communication Module AHRTU-PFBS The settings in the above three figures affect the output result of DO and AO modules as follows. 14-25 Fail-Safe Behavior Master in Clear Output hold Output result mode 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 Output hold Output result master 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.