Chapter 13 Troubleshooting

The following shows the range of the special internal output that is cleared when R7EC is set to “1.”

No.

R7C8

9 A B C D E

R7CF

R7D0

1

2

3

4

5

6

7

8

9 A R7DB

Bit special internal output

Fatal error flag

Microcomputer error

User memory error

(Undefined)

Memory size over

I/O verify mismatch

(Undefined)

(Undefined)

(Undefined)

Congestion error (normal scan)

Congestion error (periodical scan)

Congestion error (interrupt scan)

Syntax/assembler error

(Undefined)

(Undefined)

(Undefined)

(Undefined)

Battery error

(Undefined)

Self-diagnostic error

No.

WRF000

1

2

Word special internal output

Self-diagnostic error code

Syntax/assembler error details

I/O verify mismatch details

When all of the special internal output data cannot be cleared during program execution, refer to the self- diagnostic error code list and clear only the corresponding error flags by using forced set of the programmer or peripheral unit.

Caution

If the internal output for a self-diagnostic error R7DB (WRF000) is used as a system error for the stop condition of CPU RUN, the R7DB may be turned on even with an error of the warning level (battery error, etc.), causing the CPU to stop. Therefore, do not use the internal output of the self-diagnostic error as a condition for stopping the CPU.

13-2

Page 277
Image 277
Hitachi NJI-350B manual R7CF, 13-2