YASKAWA MP920 User Manual page 121

The following table describes the operation of the LED indicators when a failure has
occurred.
Failure
PROM Checksum A PROM checksum
Error error was detected dur-
ing online self-diagnosis.
SRAM Error in A hardware error was
Module detected during online
self-diagnosis.
CPU Interface Error
A data transmission error
was detected between
Module and CPU during
online self-diagnosis.
Transmission Error A normal transmission
error was detected.
Watchdog Timer A watchdog timer error
Error was detected.
Note: The number in parentheses ( ) under "Flashing" indicates the number
of flashes.
Connector Pin Layout
Table 6.1 RS-232C Connectors (CN1/RS-232C, CN2/RS-232C)
Number Signal
Name
1 FG Protective ground
2
SD Send data
3 RD Receive data
4 RTS Request to send
5 CS Clear to send
A 17LE-13090-27 (D2AC) D-sub 9-pin female connector (manufactured by Daiichi Elec-
tronic Industries Co., Ltd.) is used as the connector on the Module.
A 17JE-23090-02 (D8B) D-sub 9-pin male connector (manufactured by Daiichi Electronic
Industries Co., Ltd.) is used as the connector on the cable.
Table 6.2 RS-422/485 Connectors (CN3/RS-422)
Number Signal
Name
1 RX (-) Receive data (-)
2 RX (+) Receive data (+)
3 N.C Not connected
4
RXR (+) *
* The terminating resistance is put on the positive (+) side.
Meaning
RUN
Not lit
Not lit
Not lit
Lit
Not lit
Function Number
6
7
8
9
Function Number
5
6
7
8
6-5
6.2 Part Names
Indicators
ERR TX RX
Flashing Depends on the cir-
(1) cumstances
Flashing Not lit Not lit
(2)
Flashing Not lit Not lit
(3)
Lit Depends on the cir-
cumstances
Lit Depends on the cir-
cumstances
Signal Function
Name
N.C. Not connected
SG Signal ground (0 V)
N.C. Not connected
N.C. Not connected
Signal Function
Name
TRX (+) *
TX (-) Send data (-)
TX (+) Send data (+)
SG Signal ground
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