Instruction manual

8. TROUBLESHOOTING

IMCB14-E1

Continued from the previous page.

Symptom Probable cause Solution

Error code 1 Function code error

(An unsupported function code was

specified)

Confirm the function code

Error code 2 Written to read only data. Confirm the address of holding

Any address other than 0000H to 0019H

is specified.

PID constants or anti-reset windup

(ARW) data are set to 0 and 1 is entered

at self-tuning (ST) function

Set the PID constants and anti-reset

windup (ARW) data to any number

other than 0.

Either one of PID constants and anti-reset

windup (ARW) data are written during

execution of the self-tuning (ST) function.

Set the self-tuning (ST) function to 0.

Error code 3 The data written exceeds the setting

range.

Confirm the setting data

When the specified number of data items

in the query message exceeds the

maximum number of data items available.

Re-set the data within the range of 1

to 125 (0000H to 007DH).

Error code 4 Self-diagnostic error Turn off the power to the instrument.

If the same error occurs when the

power is turned back on, contact your

nearest RKC sales office or agent.

Error codes 1 to 4 indicate that an error response message has been transmitted.