58
NAMUR Signals: Current Outputs
Behavior during messages: HOLD, 22mA signal
Behavior during messages
Output current
[mA]
“fix (22 mA)”
HOLD
22
4
“Last usable value”
HOLD
Depending on the configuration (“Messages”)
the current outputs switch to:
• Currently measured value
• Last measured value (HOLD function)
• Fixed value (22 mA)
In the case of a fault a 22 mA signal can be
generated for the selected process variable
(1st primary value).
HOLD
"Current meas."
Behavior during messages
OK
19.0°C
83.1 % Air
22mA message
Abort
HOLD
Fixed 22 mA
Current meas.
Last usable value
Message when the current range is exceeded
As delivered, the “Maintenance request” (Warn) message is generated when the
current range is exceeded (< 3.8 mA or > 20.5 mA).
This setting can be changed in the Parameter setting menu of the respective
measuring module at “Messages”.
To generate a “Failure” message, the limit value monitoring must be set to
“Variable limits”:
Parameter setting - <measuring module> - Messages - Variable limits -
Failure limit ...
Enter the same values for the failure limits as for the current output:
Parameter setting - Module BASE - Output current - Variable Start / End.
Current outputs: Behavior during messages
Содержание Protos 3400
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Страница 177: ...177 Appendix Buffer Table Mettler Toledo ...
Страница 179: ...179 Appendix Buffer Table DIN 19267 ...
Страница 181: ...181 Appendix Buffer Table Techn Buffers to NIST ...
Страница 182: ...182 Appendix Buffer Table Hamilton ...
Страница 183: ...183 Appendix Buffer Table Kraft ...
Страница 184: ...184 Appendix Buffer Table Hamilton A ...
Страница 185: ...185 Appendix Buffer Table Hamilton B ...
Страница 186: ...186 Appendix Buffer Table HACH ...
Страница 206: ...206 Index ...
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