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Remarks
• Replace the JW-20CM
•
Check the communication cable
Check the communication
cable
Check the communication cable
Replace the JW-20CM
Check the parameter contents.
ROM error, upper CPU
RAM error, upper CPU
2 port RAM error against PC, upper CPU
2 port RAM error against communication CPU, upper CPU
ROM error, communication CPU
RAM error, communication CPU
Communication LSI error, communication CPU
No response, communication CPU
More than one token detected
Doubled address detected
Fault of sending section
Token does not return within the rated interval
Overflow of receiving buffer.
Occurs when the upper CPU processing is delayed.
Flame length error
Media error
EEPROM error
BCC error
Parameter setting error
Communication error
• After converting into octal, the lower two digits
represent the slave station number of the current
error. (Ex. 01(H) = 301(8) = slave station 01)
S7
6
5
4
3
2
1
Measure
Cause
Replace the JW-20CM
S0
01
(H)
02
(H)
03
(H)
04
(H)
11
(H)
12
(H)
18
(H)
1F
(H)
20
(H)
21
(H)
22
(H)
23
(H)
2A
(H)
2B
(H)
2C
(H)
30
(H)
BE
(H)
BF
(H)
Error
code
(HEX)
C1
(H)
FF
(H)
Check the parameter
setting and switch setting.
Check the communication
cable and slave module
LED name
• Check the communica-
tion cable
•
Check for doubled allocation
of slave station number
• Replace the JW-20CM
•
Occurs because of a media execution
error or noise from outside.
ON, OFF
to to
• Error codes “23” and “2A
(H)
” may occur when applying power. This is not an error.
• To check the communication cable, remove both connectors and short the connector terminals
at one end. Then measure the conductivity using a tester.
• Check the parameter and switch settings for all stations. If the settings are correct, replace
the JW-20CM or JW-20RS.
(Error code)