Mitsubishi Electric Melsec Q Series User Manual page 96

7 Setting and procedure for operation
7.6.6 Debugging program
QE81WH provides a test function so that you can debug a program with no input of voltage or current.
Pseudo-value can be stored into the buffer memory. For detailed explanation for the test function, refer
to 4.2.5.
Test function stores pseudo-values for setting value and error information as well as
measured value. If you use these data to control the sequence program that controls
external devices, there is a chance that erroneous control may occur. For safety of
external devices, use this function after disconnecting the device.
(1) Setting intelligent function of the module switch
1) Configure the operation mode in switch setting as shown below. (Refer to 7.6.2)
Test mode transition : Test mode
2) From the "Online" menu, select "Write to PLC" to display the dialog box of Write to PLC, and then
execute the writing to PLC parameter. After resetting the CPU module, the value will become
effective.
(2) Starting the test function
1) Reset the CPU module.
2) QE84WH starts in the test function mode. All LEDs are turned on. Pseudo-values are stored in the
buffer memory.
(3) Finishing the test function (Move back to the measuring mode)
1) Following 1) in step (1), Configure the operation mode in switch setting as shown below.
Test mode transition : Test mode
2) Following 2) in step (1), write the data into PLC.
3) Reset the CPU module, then the operation goes back to the measuring mode.
Caution
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QE81WH