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(3) Error code
When an error occurs in the JW-20CM, it stores the occurred error's code to system memory #170
of each station's PC.
Error
code
(HEX)
01
ROM error, upper CPU
02
RAM error, upper CPU
03
2 port RAM error against PC, upper CPU
04
2 port RAM error against
communication CPU, upper CPU
11
ROM error, communication CPU
12
RAM error, communication CPU
18
Communication LSI error, communication CPU
1F
No response
20
More than one token detected
21
Doubled address detected
22
Fault of sending section
23
Token does not return within the rated interval
2A
Over flow of receiving buffer.
2B
Flame length error of receiving
2C
Media error
30
EEPROM error
6E
BCC error
6F
Parameter setting error
C1
Communication error
• After converting into octal, the lower two digits
to
represent the slave station number of the current
error. (Ex. C1
FF
· In some cases, error code 23
Remarks
• The error code stored in the system memory #170 is shifted to #170 to #177 one after the other as new
errors occur. Thus, the system memory can store up to 8 errors. When the PC is operating by RAM,
these error codes do not disappear even after turning OFF the power.
The contents of system memory #170 to #177 are kept storing after the JW-20CM recovers from the
error.
#177
Disappear
Cause
= 301
= slave station 01)
(H)
(8)
or 2A
is stored when inputting power. This is not an error.
(H)
(H)
#176
#175
#174
#173
9
61
·
Error code stored to system memory
#160
#170 to 177
53
1F
20
21
22
23
2A
2B
2C
30
6E
6F
C1
to
FF
#172
#171
#170
Occurrence of BCC error
6E
Occurrence of parameter
6E
6F
setting error
(H)
Measure
Replace the JW-20CM
• Check the communication
cable
• Check for doubled allocation
of slave station number
• Replace the JW-20CM
Check the parameter setting
Replace the JW-20CM
Check the communication cable
Check the
communication cable
Replace the JW-20CM
Check the parameter setting
Check the communication
cable and slave module
9
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