2: M
ODULE
S
PECIFICATIONS
FC5A MicroSmart User’s Manual FC9Y-B1268
2-75
Error LED
The ERR LED on expansion interface modules flashes and turns on depending on the error condition.
Error LED
Description
Turns ON
When the CPU module has an error.
When the scan time exceeds 1000 ms.
(Do not set the constant scan time of special data register D8022 to longer than 1000 ms.)
Flashes
(500ms period)
When the expansion interface module or the expansion interface slave module is not powered by the exter-
nal power supply.
Flashes
(1000ms period)
When an initialization error occurred in an I/O module connected to the right of the expansion interface
module.
When more than eight I/O modules are mounted to the right of the expansion interface module.
When any module other than digital I/O modules is mounted to the right of the expansion interface module.
Note:
When an AC input module is mounted to the right of the expansion interface module, the ERR LED does not turn on.
Special Data Register for Expansion Interface Module
Slim type CPU modules have a special data register for the expansion interface module. Special data register D8252
stores the refresh time (in units of 100 µs) of additional expansion I/O modules mounted to the right of the expansion
interface module.
DR No.
Data Register Function
DR Value Updated
R/W
D8252
Expansion interface module I/O refresh time (
100 µs)
Every scan
R
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