Register 0X1101 - Watchdog Status; Register 0X1102 - Watchdog Timeout; Register 0X1103 - Watchdog Config; Table 203: Watchdog Status - WAGO I/O SYSTEM 750 Manual

284 MODBUS – CODESYS 2
9.5.4.2 Register 0x1101 – Watchdog Status
This register provides the current state of the MODBUS watchdog.
The following states are possible:

Table 203: Watchdog Status

Value
0xFFFF
0x0000
0x0001
0x0002
9.5.4.3 Register 0x1102 – Watchdog Timeout
This register contains the value for the watchdog timeout. The step width is
100 ms and the maximum value is 65535 (corresponds to 6553.5 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, WATCHDOG_STOPPED and
WATCHDOG_EXPIRED. However, if the watchdog is active
(WATCHDOG_RUNNING state), this register can only be read. The response to
a write operation is an ILLEGAL_FUNCTION (0x01) exception.
9.5.4.4 Register 0x1103 – Watchdog Config
This register contains the configuration parameters for the watchdog. The register
is organized in bits, see following table.
Name
WATCHDOG_
UNCONFIGURED
WATCHDOG_
STOPPED
WATCHDOG_
RUNNING
WATCHDOG_
EXPIRED
750-8208 PFC200 CS 2ETH RS CAN DPM
Explanation
The MODBUS watchdog is not configured, the
"Watchdog Timeout" register (0x1102) contains
the value 0. This state can only be closed by
setting a timeout > 0.
The watchdog is configured, the "Watchdog
Timeout" register (0x1102) contains a value >0.
In the STANDARD_WATCHDOG operation
mode the watchdog can be activated in this state
by the WATCHDOG_START command. This
state cannot be reached in the
ALTERNATIVE_WATCHDOG operation
mode since the watchdog is started
automatically here.
The MODBUS watchdog is active, i.e.
configured and started. The set timeout has not
yet expired.
The timeout set in register 0x1102 (Watchdog
Timeout) has expired. In the
STANDARD_WATCHDOG operation mode,
the watchdog in this state must be reset to the
WATCHDOG_STOPPED state with the
WATCHDOG_RESET command. In the
ALTERNATIVE_WATCHDOG operation
mode, the watchdog is automatically restarted
with the next trigger.
Version 1.1.0, valid from FW Version 02.06.20(09)
WAGO-I/O-SYSTEM 750
Manual