Block - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

Ex.
Troubleshooting of when an error has occurred in a process control function block
1.
Display the module diagnostics (CPU diagnostics) in the engineering tool.
[Diagnostics]  [Module Diagnostics (CPU Diagnostics)]
2.
Check the error code and detailed information on the module diagnostics (CPU diagnostics) window.
In the above example figure, the error code and detailed information are displayed as follows.
Error code: 3400
Processing: PIDP operation
Cause: Division where the divisor is zero was performed.
3.
Click the [Error Jump] button to display the function block where the error has occurred. In the following example, the
function block is M+P_PIDP_EX_T_.
4.
Check the explanation of the corresponding function block in this manual.
Identify the location of the operation where caused the error and change current values of the input data, public variable, and
tag data used in the operation.
In the case of error example above, check the current values, which may cause a division where the divisor is zero in a PIDP
operation, of the following items in the function block of M+P_PIDP_EX_T_. Change the current value in the location where
causes the error.
• Gain (PROPORTIONAL)
• Engineering value high limit (RH)
• Engineering value low limit (RL)
• Integral time (INTEGRAL)
• Derivative time (DERIVATIVE)
• Derivative gain (MTD)
• Control cycle (CT)
2 PROCEDURE BEFORE USING PROCESS CONTROL FUNCTION BLOCK
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2.8 Troubleshooting
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