WAGO I/O SYSTEM 750 XTR
Modbus – CODESYS 2 309
750-8202/040-001 PFC200 2ETH RS TELE XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
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.
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.
Table 223: Watchdog Configuration
Bit Name/Bit Identifier Explanation
0 EXPLICIT_
TRIGGER_ONLY
Activates the Explicit Trigger mode
0* All valid Modbus requests are considered as
watchdog triggers. The only exception is the
access to the register 0x1101 (Watchdog Status).
1 Only the writing of register 0x1100 (Watchdog
Command) with the value 0x5555
(WATCHDOG_START) is considered as a
watchdog trigger. The access to the register
0x1101 (Watchdog Status) is also an exception
here.
1 TRIGGER_ON_
STATUS_REG
Activates the watchdog trigger by (read) access to
register 0x1101 (Watchdog Status)
0* The reading of the watchdog status is not
considered as a watchdog trigger.
1 The reading of the watchdog status triggers the
watchdog.
2 CLOSE_ALL_TCP_
CONNECTIONS
Activates the closing of all Modbus TCP connections
with the expiry of the timeout (transition to
WATCHDOG_EXPIRED state)
0 Existing Modbus TCP connections remain open.
1* All existing Modbus TCP connections are closed.
* Default setting
The individual options are activated when the specific bit, or bit combination, is
set.
