INFICON T-Guard Leak Detection Sensor Interface description - Manual (Page 33)

Profibus-DP Protocol
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5 Profibus-DP Protocol
5.1 Preface
In order to use Profibus-DP with T-Guard, you must have ordered a T-Guard in the
Profibus version (Cat. No. 540-002). It is not possible to add the Profibus option to
Cat. No. 540-001.
When setting up the Profibus communication you need to use the GSD file provided
by INFICON.
5.2 Process Data Mapping for Cyclic Data Transfer
5.2.1 Read Process Data (PLC-> Leak Detector)
This data is sent periodically from the programmable logic controller to the leak
detector:
Notice The Profibus-DP protocol is subject to change.
If you are using this protocol, please ask INFICON for an update.
Byte Bit Name Meaning
Similar to PLC
Input
Similar to RS232
ASCII cmd.
0 not used
1 not used
2 CLEAR
Transition 0->1:Clears errors and
warnings
CLEAR *CLS
3 not used
4 CAL Transition 0->1: Start calibration CAL *CAL:START
5 PROOF Transition 0->1: Start proof PROOF
6 STOP Transition 0->1: Stop STOP *STOP
7 START Transition 0->1: Start START *START
0 PURGE_STOP
Transition 0->1 = Stop purging the
measurement line
*PURGE:STOP
1 PURGE_START
Transition 0->1 = Start purging the
measurement line
PURGE *PURGE:START
2 not used
3 not used
4 STANDBY
Transition 0->1: Switch to
stand-by
STANDBY *STANDBY
5 GROSS/FINE
Switch between GROSS and
FINE (in Cont. Mode only)
GROSS/FINE *GROSS ON
6 READY
Transition 0->1: Wake up leak
detector from stand-by mode
READY *STANDBY:STOP
7 not used
0
1