Instruction Manual

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APPLICATION EXAMPLES

FC5A MicroSmart PID Module User’s Manual FC9Y-B1283 7-13

8. Ladder Programming

Create a ladder program to control the PID module.

Ladder Program Example

Notes:

• The ladder program should be customized depending on actual applications.

• Perform the auto-tuning (AT) near the set point (SP). If auto-tuning (AT) is performed near the ambient

temperature, temperature fluctuation cannot be given to the process. In such case, the auto-tuning (AT) may not

finish normally.

• Once auto-tuning (AT) is performed, it is unnecessary to perform auto-tuning (AT) again as long as the process is

unchanged.

While external input I0 is on, CH0 control is

enabled. When Q0 (CH0 control upper limit

alarm output) is on, CH0 control is disabled.

When external input I1 is turned on, CH0

program control is started. When I1 is tuned off,

the program control is stopped.

When CH0 alarm 1 is triggered, Q0 is turned on.

While external input I2 is on, auto-tuning (AT) is

performed in each step of the program control

as follows:

• Step 0: When the remaining time is 5 minutes

• Step 1: When step 1 is started

• Step 2: When the remaining time is 5 minutes

• Step 3: When step 3 is started

When CH0 program control is completed, Q1 is

turned on.

While external input I3 is on, CH1 control is

enabled. When Q2 (CH1 control upper limit

alarm output) is on, CH1 control is disabled.

When external input I4 is turned on, CH1

program control is started. When I4 is turned off,