Pilz PNOZ mm0p 24VDC - Manual (Page 98)

Modbus/TCP
Operating Manual PNOZmulti communication interfaces
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Control Register
A watchdog can be activated in Control Register 255.
If no input bits are set by a Modbus/TCP subscriber within the preset time, the PNOZmulti
will set the input bits to "0".
The table below describes the Modbus/TCP data areas for the watchdog.
A relevant area for the watchdog is defined in each Modbus/TCP data area (Coils (0x), Dis-
crete Inputs (1x), Input Register (3x), Holding Register (4x)). Read/write access will depend
on the Modbus/TCP data area.
Register
(3x, 4x)
Coil/
Descrete Input
(0x, 1x)
Content High Byte Low Byte
255 4095...4080 Control Register See table below
High Byte WD-Trig-
ger
Error Mes-
sage
Reserved Reserved Reserved W-Timer
Bit 2
W-Timer
Bit 1 W-Timer
Bit 0
Low Byte Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Bit 15 "Watchdog Trigger": The watchdog can be triggered by setting Bit 15 constantly to
"1", or by a Client writing in the input area of the 128 inputs. The state of the bit when read-
ing is undefined. A 1 or a 0 can be read.
Bit 14 "Error Message": If this bit is set, an error stack entry is generated when the watch-
dog is triggered.
Bits 10 … 8 "WD Timer": If the set time for the watchdog is set, then Bit 15 must be set, or
become set, at the same time.
Watchdog Timer Bit 2 Watchdog Timer Bit 1 Watchdog Timer Bit 0 Watchdog Time
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
Information
To check whether the watchdog has been triggered, set a virtual input per-
manently to "1".
If the corresponding input in the PNOZmulti is "0", then the watchdog has
been triggered.
6.4.4.2