IFM Electronic TAD 91 Series, Operating Instructions Manual

Page: 9 / 17

9
UK
Diagnostic messages Diagnostic
cases
(→ 5.2.3)
[drEd] Warning Alarm Failure
= ON
●
7���9
= ONdr
● ●
3���9
= OFF
● ● ●
1���9
Table 1: Setting of diagnostic cases to be signalled (2-wire operation)
-Setting [drEd] = ON provides maximum availability since the transmission of the meas-
ured temperature value is only interrupted for the diagnostic message in diagnostic cases
of category "failure"�
-Setting [drEd] = OFF provides maximum reliability of error detection since a diagnostic
message is provided for every diagnostic case�
To signal a diagnostic case the transfer of the measured temperature data is
interrupted and provided by the following analogue signal depending on the
setting of [FOU]:
[FOU2] = ON: 21�5 mA
[FOU2] = OFF: 3�5 mA
In the event of undervoltage (diagnostic case 6 → 5.2.3 ) no diagnostic
message is provided in 2-wire operation�
5.2.5 Diagnostic function in 3-wire operation
In 3-wire operation the analogue output is used for temperature measurement and
diagnostics� In addition a switching output is used for diagnostics�
With [drEd] the diagnostic cases to be signalled can be set via the current output:
Diagnostic messages Diagnos-
tic cases
(→ 5.2.3)
[drEd] Output Warning Alarm Failure
= ON Analogue output
●
7���9
Switching output
●
7���9
= ONdr Analogue output
●
7���9
Switching output
● ●
3���9
= OFF Analogue output
●
7���9
Switching output ● ● ●
1���9
Table 2: Setting of diagnostic cases to be signalled (3-wire operation)