Beijer Electronics NA-9379 - Manual (Page 73)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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A.4.3. Adapter Watchdog Time, other Time Special Register (0x1020, 4128)
A watchdog timer can be configured for timeout periods up to 65535(1unit=100msec). The Watchdog timer will
timeout (timer decreased, reached 0) if MODBUS operation to the slave node does not occur over the configured
watchdog value, then the slave adapter forces that slot output value is automatically set to user-configured fault
actions and values.
Address Access Type, Size Description
0x1020(4128) Read/Write 1 word
Watchdog time value 16bit unsigned.
The time value is represented by multiples of 100msec.
The 0 (watchdog timeout disabled) is default value.
A changing of watchdog time value resets watchdog error and
counter.
0x1021(4129) Read 1 word
Watchdog timer remain value
This value is decreased every 100msec
0x1022(4130) Read 1 word
Watchdog error counter, it is cleared by writing address
0x1020
0x1023(4131) Read/Write 1 word
Enable/disable auto recovery Watchdog error when receiving
new frame.
0:Disable, 1:Enable(default). Its value is stored in EEPROM.
0x1028(4136) Read 4 words
I/O update time, Expansion Module Process time, CoDeSys
update time, CoDeSys Process Time. (1usec unit)