5-6
IM MW100-01E
5.2 Main Module Specifications
Operation after power failure:
If a power failure occurs during a computation, the value
computed just before the power failure is recalled after recovery,
and computation starts using that value.
Type Value after power failure recovery
MATH channel data Holds previous value
Communication input channel data Holds previous value
Flag input channel data Holds previous value
Program channel data Holds elapsed time and previous value
RJC
Because the input terminal section is approximately equal to the room temperature in the
temperature measurement using a thermocouple, the actual output of the thermocouple
is different from the values given on the thermoelectromotive force table based on 0°C.
The MW100 performs compensation by measuring the temperature at the terminal of the
universal input module and adding the corresponding thermoelectromotive force to the
actual output of the thermocouple. For the compensation accuracy, see the specifications
of each module.
Internal RJC: Uses the reference junction compensation function of the universal input
module.
External RJC: Uses an external reference junction compensation function. Set the RJC
voltage to be added to the input.
Junction compensation setting range: –20000 to 20000 (µV)
Remote RJC: See “Remote RJC” in this section.
Remote RJC
When the item to be measured is located at a great distance, you can setup relay
terminals near the item, measure between the relay terminal and the input terminal
of the universal input module (reference channel) using thermocouples, and use the
resultant value as the reference junction compensation of the temperature measurement.
However, the same thermocouple type is used for reference channels and measured
channels.
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