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312 MODBUS – e!RUNTIME
11.2.1.2
Register 0xFA01 – Watchdog Timeout
This register contains the value for the watchdog timeout. The step width is 1 ms
and the maximum value is 65535 (corresponds to 65.535 s). The default value is
0. In this case the watchdog cannot be started and will have the
WATCHDOG_UNCONFIGURED state.
The register can be read and written in the states
WATCHDOG_UNCONFIGURED and WATCHDOG_STOPPED. However, if the
watchdog is active or expired (WATCHDOG_RUNNING and
WATCHDOG_EXPIRED state), only read access to this register is possible. The
response to a write operation is an ILLEGAL_FUNCTION (0x01) exception.
11.2.1.3
Register 0xFA02 – Watchdog Status
This register provides the current state of the MODBUS watchdog.
The following states are possible:
Table 218: Watchdog Status
Value
0xFFFF
0x0000
0x0001
0x0002
Manual
Draft version 1.2.1 from 2017-09-13, valid from FW Version 02.06.20(09)
Name
WATCHDOG_
UNCONFIGURED
WATCHDOG_
STOPPED
WATCHDOG_
RUNNING
WATCHDOG_
EXPIRED
750-8207 PFC200 CS 2ETH RS 3G
Explanation
The MODBUS watchdog is not configured, i.e.,
register 0xFA01 (Watchdog Timeout) contains
the value 0. Only the setting of a timeout > 0 s
can close this state.
The MODBUS watchdog is configured, the
register 0xFA01 (Watchdog Timeout) contains a
value >0. In the ADVANCED_WATCHDOG
operation mode, the watchdog can be activated
in this state with the WATCHDOG_START
command. In the SIMPLE_WATCHDOG
operation mode, this state cannot be accessed
since the watchdog is automatically started.
The MODBUS watchdog is active, i.e.
configured and started. The set timeout has not
yet expired.
The timeout set in register 0xFA01 (Watchdog
Timeout) has expired. In the
ADVANCED_WATCHDOG operation mode, the
watchdog in this state must be reset to the
WATCHDOG_STOPPED state with the
WATCHDOG_RESET command. In the
SIMPLE_WATCHDOG operation mode, the
watchdog is automatically restarted with the
next trigger.
WAGO-I/O-SYSTEM 750
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