Yokogawa Standalone MW100 - Manual (Page 219)

5-6 IM MW100-01E
MATH alarm function: Four levels per channel
Type: Upper limit, lower limit, delay upper limit, and delay lower
limit. No hysteresis function available.
Loss of computed data:
In the monitor screen, when the MATH performance meter
exceeds 100%, some computations at each MATH interval cannot
be completed, and loss of computed data occurs. When this
happens, the previous computed value is held. If computation
loss occurs frequently, lengthen the MATH interval to reduce the
load. To stop computation promptly, press the Stop key on the
main module.
When the volume of computations is high:
Display updating on the monitor screen, response to computation
stop operations, and other behavior may be slow. To stop
computation promptly, press the Stop key on the main module.
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
With temperature measurement using thermocouples, the input terminal section is
nearly at room temperature, therefore the actual thermocouple output differs from the
value in the table for the thermoelectromotive force with the 0°C standard. Modules able
to measure temperature with thermocouples can be compensated by measuring the
temperature of the terminal and adding the corresponding thermoelectromotive force to
the actual thermocouple output. For the compensation accuracy, see specifications of
individual modules.
Internal RJC: Uses the reference junction compensation function of a module capable
of measuring temperature with thermocouples.
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 (RRJC)
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 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.
5.2 Main Module (MW100-E) Specifications