Yaskawa MP920 User's Manual Design - Manual (Page 316)

5.6 Communications Modules
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5
The LED indicators indicate error or failure occurred in the Module as shown below.
Note: The number in parentheses ( ) indicates the number of blinkings.
„ RS-232C Ports 1 and 2 (CN1 and CN2)
„ RS-422/485 Port (CN3)
Error/Failure Details of Error/Failure LED Indicators
RUN ERR TX RX
PROM
checksum error PROM checksum error
was detected during
online self-diagnosis. Unlit Blink-
ing (1)
Depends on the
conditions.
SRAM error in Module A hardware fault was
detected during online
self-diagnosis. Unlit Blink-
ing (2)
Unlit Unlit
CPU
interface error An error in the data
transmission with CPU
was detected during self-
diagnosis. Unlit Blink-
ing (3)
Unlit Unlit
Transmission error Transmission data error Lit Lit Depends on the
conditions.
Watchdog timeout error Watchdog timeout Unlit Lit Depends on the
conditions.
The CN1 and CN2 are used to connect devices with RS-232C inter-
face.
No standard cable available.
The CN3 is used to connect a device with RS-422 or RS-485 inter-
face.
No standard cable available.