Pilz PNOZ mmc1p ETH - Manual (Page 15)

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3-5
3.4 Assignment of data areas
3 Modbus/TCP - Data areas
3.4.2 Control Register
Control Register 3- ModbusTCP_Datenbereiche-Control Register-PNOZmulti
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 watch-
dog.
A relevant area for the watchdog is defined in each Modbus/TCP data
area (Coils (0x), Discrete Inputs (1x), Input Register (3x), Holding Register
(4x)). Read/write access will depend on the Modbus/TCP data area.
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 reading 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 watchdog is triggered.
Bit 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.
Register
(3x, 4x) Coil/
Discrete 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
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