Unused Channel Setting; Forced Pid Control Stop - Mitsubishi Electric MELSEC Q Series User Manual

3 SPECIFICATIONS

3.2.5 Unused channel setting

3.2.6 Forced PID control stop

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(1) Channels where temperature sensors are not connected
The Q64TC performs upscale processing on the channels where temperature
sensors (thermocouples/platinum temperature-measuring resistors) are not
connected.
Hence, when a temperature sensor is not connected to the channel which will not
exercise temperature control, the PV value is judged as higher than the
temperature measurement range of the input range, and the "ALM" LED is lit by
alert processing.
(2) Unused channel setting
(a) To make unused channel setting, write "1" to Unused channel setting (buffer
memory address: 3D
(b) After the unused channel setting has been made, no alert will occur at the
channel with no temperature sensor connected and the "ALM" LED will not
be lit.
The sampling period remains unchanged if the unused channel setting is
performed.
(1) Forced PID control stop
Forced PID control stop is a function to stop PID operations temporarily from the
programmable controller CPU.
The action to be taken by the Q64TC at a PID operation stop depends on the
setting of Stop mode setting (buffer memory address: 21
(2) Executing forced PID control stop
To execute a forced PID control stop, turn on Forced PID control stop command
(YnC to YnF).
At this time, Manipulated value (MV) (buffer memory address: D
-50 (-5.0%).
(3) Cancelling forced PID control stop
When Forced PID control stop command (YnC to YnF) is turned off, a forced PID
control stop is cancelled and PID operations are resumed at the manipulated
value which was output during the forced PID control stop.
POINT
Setting the programmable controller CPU to the STOP status turns off Forced PID
control stop command (YnC to YnF), "cancelling the forced PID control stop".
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