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Chapter 12: Errors and Countermeasures
The operating condition of the JW-21MN can be monitored using its indication lamps, flags, and the
system memory of a PC.
12-1 Indication lamps
LED
name
Lights during data link operation
CM
SD
Lights while sending data
Lights while receiving data
RD
Lights when detecting carrier
CD
LT
Lights when turning "ON" the termination resistance
Lights during testing (TEST)
T
Lights at a communication error
COM.E
(COM. E)
Lights at time up of the watchdog timer
UNT.E
LED "1" to "80" indicate error codes when an error occurs. Error codes, their
causes, and measures are as shown in the table below.
LED name
80
40
20
10
8
4
2
1
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to
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* Error code 60
(H)
Other codes are error codes specified by the ME-NET.
Prior to displaying the error code C1 to FF
007750 to 007757
Details
- Check disconnection of the communication
cable
- Check the set contents of switches
- Cheek the set contents of parameters
- Check the power voltage of PC
Replace the JW-21MN
Error
Cause
code
(DEC)
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, communication CPU
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
30
EEPROM error
*60
Switch setting 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
*
FF
error. (Ex. C1
= 301
(H)
(8)
, 6E
, C1 to FF
are special error codes unique to the JW-21MN.
(H)
(H)
is required. (See page 16-12.)
(8)
12-1
Measure
Replace the JW-21MN
- Check the communication
cable
- Check for doubled allocation
of station number
- Replace the JW-21MN
Check the parameter setting
Replace the JW-21MN
Check the communication cable
Check the communication cable
Replace the JW-21MN
Check the switch setting
Check the parameter setting
Check the communication cable
and slave module
= slave station 01)
, the setting of the parameter addresses
(H)
ME-NET
COMM
RD
LT
COM.E
SD
CD
T
UNT.E
80 40 20 10 8
4
2
1
Measure
12
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