Diagnostics and troubleshooting Liquisys M CLM223/253
78 Endress+Hauser
No PROFIBUS
®
communication
No central PA/DP module Verify by looking at nameplate:
PA = -xxx3xx /DP = xxx4xx
Upgrade to LSCP module,
see chapter "Spare parts".
Incorrect instrument software
version (without PROFIBUS)
For further information, see BA00209C/
07/EN "PROFIBUS PA/DP - Field
communication with Liquisys M
CxM223/253".
Commuwin (CW) II:
Incompatible CW II and instrument
software versions
No or incorrect DD/DLL
Incorrect baud rate setting for
segment coupler in DPV-1 server
Incorrect station (master) addressed
or duplicate address
Incorrect station (slaves) address
Bus line not terminated
Line problems
(too long, cross section too small; not
shielded, screen not grounded, wires
not twisted)
Bus voltage too low
(bus supply voltage typ. 24 V DC for
non-Ex)
Voltage at instrument’s PA/DP
connector must be at least 9 V.
Error Possible cause Tests and / or remedial measures Equipment, spare parts, personnel
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