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166 •
MODBUS Functions
Internal Variables
0x2000
0x2001
0x2002
0x2003
0x2004
0x2005
0x2006
0x2007
0x2008
0x2010
0x2011
0x2012
0x2013
0x2014
0x2020
0x2021
0x2022
0x2023
0x2030
0x2031
0x2032
0x2033
0x2040
0x2041
0x2042
0x2043
4.2.5.1 Description of the internal variables
4.2.5.1.1 Watchdog (Fieldbus failure)
The watchdog monitors the data transfer between the fieldbus master and the
controller. Every time the controller receives a specific request (as define in
the watchdog setup registers) from the master, the watchdog timer in the
controller resets.
In the case of fault free communication, the watchdog timer does not reach its
end value. After each successful data transfer, the timer is reset.
If the watchdog times out, a fieldbus failure has occurred. In this case, the
fieldbus controller answers all following MODBUS TCP/IP requests with the
exception code 0x0004 (Slave Device Failure).
In the controller special registers are use to setup the watchdog by the master
(Register addresses 0x1000 to 0x1008).
R
1
Constant 0x0000
R
1
Constant 0xFFFF
R
1
Constant 0x1234
R
1
Constant 0xAAAA
R
1
Constant 0x5555
R
1
Constant 0x7FFF
R
1
Constant 0x8000
R
1
Constant 0x3FFF
R
1
Constant 0x4000
R
1
Firmware version
R
1
Series code
R
1
Controller code
R
1
Firmware versions major revision
R
1
Firmware versions minor revision
R
16
Short description controller
R
8
Compile time of the firmware
R
8
Compile date of the firmware
R
32
Indication of the firmware loader
R
65
Description of the connected busmodules (module 0–64)
R
64
Description of the connected busmodules (module 65-128)
R
64
Description of the connected busmodules (module 129-192)
R
63
Description of the connected busmodules (module 193-255)
W
1
Software reset (Write sequence 0x55AA or 0xAA55)
W
1
Format Flash-Disk
W
1
Extract HTML sides from the firmware
W
1
Factory Settings
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
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