MR MESSKO COMPACT - General Malfunctions (Type TTM); Analog Signal Malfunctions

9 Fault elimination
96 5831400/02 EN
9.2 General malfunctions (type TTM)
You are using a device with Modbus and active 4…20mA analog output.
Characteristics/
details
Cause Remedy
No function
(4...20mA)
Power supply not present ▪ Check cables
▪ Check power supply (18…
30VDC)
▪ Check 4…20mA receiver
(loop into multimeter)
▪ Check the Modbus receiver
(supply, configuration)
No function (Mod-
bus)
Table10: General faults
9.3 4…20mA analog signal malfunctions (type TT and type TTM)
Characteristics/
details
Cause Remedy
Loop current is ap-
prox. 3mA
▪ Device signals detected er-
ror
▪ At 3mA: The self-diagnosis
has detected an error that
does not allow a reliable in-
dication of the measure-
ment.
▪ Type TTM: For possible
causes/remedies, see sec-
tion Self diagnosis/Data
point DEVICE STATUS
[►Section 9.5, Page 98]
The receiver does
not measure any
4…20mA loop
current
▪ 4…20mA analog output
was deactivated by holding
register 4
▪ Conductor break, open ter-
minal point
▪ Short circuit
▪ Power supply not present
▪ Device defective
▪ Activate 4…20mA analog
output: switch holding regis-
ter 4 from 0 to 1
▪ Loop in multimeter and
measure
▪ Check cables
▪ Check device supply (18…
30VDC)