<8. Detailed Description>
- Power supply failure of extension unit 2 (using SB bus)
In a system that uses extension unit 3, even if the power supply module of
extension unit 2 fails, I/O on extension unit 3 will not detect a failure.
- I/O in disconnected state
- CPU control in STOP state
• Analog output module operation settings
To define the operation of an analog output module upon detection of a CPU
failure, enable or disable CPU failure detection (output fallback operation) on
module basis and then specify the fallback operation upon CPU failure detection
on channel basis.
The channel-based setting is valid only if the module-based setting is set to
“YES.”
Output fallback (module-based setting)
YES: Performs output fallback operation when CPU failure is detected.
NO : Ignores any detected CPU failure.
Output fallback operation (channel-based setting)
HOLD: Maintains current output state when CPU failure is detected.
SETV: Outputs specified value when CPU failure is detected.
• Digital output module operation settings
Operation of a digital output module upon detection of a CPU module can be
configured using a module-based setting. Configuration cannot be done for
individual channels.
Output fallback (module-based setting)
HOLD : Maintain current output state when CPU failure is detected.
OFF : Turns all channels off when CPU failure is detected.
NO : Ignores any detected CPU failure.
● Checking Reverse Output Operation
To reverse physical current and voltage output so as to match field equipment,
enable reverse output operation on channel basis using Resource Configurator.
Reverse output operation: YES Reverses physical output
Example: 4 to 20mA current output
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