Wdi100 Data Structure At The Plc; Input Data From The Input Module Wdi100 - ABB Wireless Proximity Switches Planning And Installation Manuallines

Planning and
Installation Guidelines
V 6 Technical Description

3.11 WDI100 data structure at the PLC

3.11.1 Input data from the input module WDI100

Wireless Proximity Switches / Issue: 09.2004
For each communication module WSIX two bits are provided via the field bus:
•
The "proximity" bit contains the proximity information of the sensorhead. The proximity bit
keeps the last received information until a change is received.
•
The "DataValid" bit gives the automation system / PLC the possibility to check, if this
proximity bit is "valid". The "DataValid"-Bit should be normally 1 and is set to "0" as long as
at least one of the two conditions below is pending:
− The input module WDI has not received a telegram within the last 600ms from this
communication module (missing "I´am alive signal" of this communication module).
− The "Sensor Event Lost"-Bit in the WSIX telegram was set. This happens if too many
proximity changes occur, to be transmitted correctly (more than two within ~20ms).
Example: One change is transmitted, which may take up to 20ms, a second change
during that time will be stored and processed if the first transmission has been
finished successfully.
The data structure on the Fieldbus is as follows:
WORD 0 Proximity
WORD 1 DataValid
WORD 2 Proximity
WORD 3 DataValid
WORD 4 Proximity
WORD 5 DataValid
WORD 6 Proximity
WORD 7 DataValid
WORD 8 Proximity
WORD 9 DataValid
WORD 10 Proximity
WORD 11 DataValid
WORD 12 Proximity
WORD 13 DataValid
WORD 14*) Proximity
WORD 15*) DataValid
*)
Word 14 and 15 is only half full, because there are max. 120 WSIX (not 128).
There is an offset of 1 between internal and external counting of the WSIX numbers:
Sensor 1 at the display of the WDI means WSIX0
in the field bus data structure.
MSB LSB
WSIX15 WSIX0
WSIX15 WSIX0
WSIX31 WSIX16
WSIX31 WSIX16
WSIX47 WSIX32
WSIX47 WSIX32
WSIX63 WSIX48
WSIX63 WSIX48
WSIX79 WSIX64
WSIX79 WSIX64
WSIX95 WSIX80
WSIX95 WSIX80
WSIX111 WSIX96
WSIX111 WSIX96
WSIX119 WSIX112
WSIX119 WSIX112
Planning and Installation Guidelines 37