Communication modules
Operating Manual Communication interfaces
1002971EN03
42
INFORMATION
If a fieldbus module is configured, virtual inputs cannot be activated via the
communication module.
5.7.3.1
Control Byte (Byte 40)
Bit 0 … 2 of the Control Byte contain a watchdog function.
If no virtual inputs are sent by a communications partner within the defined watchdog time
(watchdog timeout), the PNOZmulti 2 sets the virtual inputs to "0".
Control Byte 40:
Reserved Delayed
Re
sponse
Error
Message
Reserved Reserved WTimer
Bit2
WTimer
Bit1
WTimer
Bit0
}
Bit 0 2: Watchdog Timeout
Watchdog Timer
Bit 2
Watchdog Timer
Bit 1
Watchdog Timer
Bit 0
Watchdog Timeout
0
0
0
Timer deactivated
0
0
1
100 ms
0
1
0
200 ms
0
1
1
500 ms
1
0
0
1 s
1
0
1
3 s
1
1
0
5 s
1
1
1
10 s
}
Bit 3 and 4: Reserved
}
Bit 5 Error Message: Error message
If the bit is set to "1", an error stack entry is generated when the watchdog is triggered.
}
Bit 6 Delayed Response: Delayed response
If the bit is set to "1", the response (send virtual outputs) is sent after a delay of one
cycle.
}
Bit 7: Reserved
INFORMATION
To test if the watchdog is active, set a virtual input continuously to "1".
If this input becomes "0" after the set watchdog timeout has elapsed, then
the watchdog is active.
