Manual
Double Sheet Detector-series I20
Communication with the PLC
B0069991 / Rev. 1.7
60
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6.3.4 Program
switching
All 255 measuring programs can be selected via the PLC inputs IN1 to IN9.
Attention:
The inputs IN2 to IN9 are used also for functions other then the selection of the
measuring programs. This means that the timing has to be followed exactly.
1
Check whether the output OUT0 “Enable” has been switched to HIGH (ready for operation), otherwise a
fault condition is existing.
2
Before selecting a measuring program all inputs must be switched to LOW for 10 ms.
3
Switch the input IN1 “program selection” to HIGH.
4
Simultaneously with
3
or delayed switch the binary value to IN2…IN9.
5
Max. 10ms after having switched IN1 “Program selection” the outputs OUT1…OUT4 are switched to
LOW.
6
After the binary value has been present for a minimum of 10 ms, switch the input IN1 “Program
selection” to LOW.
7
Simultaneously with
6
or delayed switch back the binary values at IN2…IN9 (switch to LOW).
8
After a maximum time of 250ms the outputs OUT1…OUT3 are switched to HIGH.
If the configuration “Measurement: Demo mode” has been selected, measurement will re-start
automatically (if a valid program has been selected). If the configuration “Measurement external” has
been selected, the operation of the unit is then performed via the PLC.
Note:
Program-No.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1
0 0 0 0 0 0 0 0
2
0 0 0 0 0 0 0 1
3
0 0 0 0 0 0 1 0
…
… … … … … … … …
254
1 1 1 1 1 1 0 1
255
1 1 1 1 1 1 1 0
Not
used 1 1 1 1 1 1 1 1
OUT0
Enable
Program switching
Bit 0-7
Meas. Start
>=0ms
1
min. 10ms
0-1-2-sheet; Warning
total switching time > 80-320 ms
IN1
OUT1, 2, 3, 4
IN2-9
2
8
3
5
6
7
4
>=0ms
min. 10ms
10-250ms*
IN0
max. 10ms
* depending on nominal thickness and material