WAGO I/O SYSTEM 750 XTR
Modbus – CODESYS 2 305
750-8202/040-001 PFC200 2ETH RS TELE XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
Figure 101: State Diagram, ALTERNATIVE_WATCHDOG Operation Mode
The state diagram for the ALTERNATIVE_WATCHDOG operation mode shows
that the watchdog is always active as soon as a timeout time > 0 is set in the
register 0x1102 (Watchdog Timeout). The writing of commands in the register
0x1100 (Watchdog Command) is limited in this operation mode. Only the
WATCHDOG_START command is permitted as a possible trigger. The only
possibilities to deactivate or stop the watchdog in ALTERNATIVE_WATCHDOG
mode are the setting of the timeout register to 0 after the timeout has elapsed
and the switching back to the STANDARD_WATCHDOG operation mode.
The following diagram shows the possible state transitions when operation
modes are switched.