3 process data mapping for cyclic data transfer, 1 read process data (plc ® leak detector), Read process data (plc – INFICON HLD6000 Refrigerant Leak Detector Interface Description User Manual
Page 31: 1 read process data (plc, Leak detector)

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4.3
Process Data Mapping for Cyclic Data Transfer
4.3.1
Read Process Data (PLC
Leak Detector)
This data word (2 Bytes) is send periodically from the field bus master (e.g. programmable logic controller) to the leak
detector:
PROFIBUS and PROFINET IO receive high byte first, DeviceNet and EtherNet/IP receive low byte first.
Attention:
If you want to use "Valid setpoint" function via fieldbus please make sure, that the "probe key configuration" ist set to "off".
Title Byte
Bit
Name
Meaning
Similar to PLC
Input
Similar to RS232
ASCII cmd.
Similar to RS232
LD cmd.
co
ntrol word
1
(low
byte)
0
Start
Transition 0->1: Switch from standby to measure
Start
*Start
1
1
Stop
Transition 0->1: Switch from measure to standby
Stop
*Stop
2
2
Clear
Transition 0->1:Clears errors and warnings
Clear
*CLS
5
3
Valid setpoint
Transition 0->1: Switch to Setpoint 2
Transition 1->2: Switch to Setpoint 1
4...6
not used
reserved for further use
7
Cal_extern
Transition 0->1: Start external calibration
Transition 1->0: Acknowledge
*CAL
4
2
(high
byte)
0...7
not used
reserved for further use