INFICON HLD6000 Refrigerant Leak Detector Interface Description - Manual (Page 31)

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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