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12-1
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 "1" to "80" indicate error codes when an error occurs. Error codes, their
causes, and measures are as shown in the table below.
ON, OFF
* Error code 60(H), 6E(H), C1 to FF(H) are special error codes unique to the JW-21MN.
Other codes are error codes specified by the ME-NET.
Prior to displaying the error code C1 to FF(H), the setting of the parameter addresses
007750 to 007757(8) is required. (See page 16-12.)
ME-NET
80 40 20 10 8 4 2 1
COMM
SD
RD
CD
LT
T
COM.E
UNT.E
Measure
LED
name
CM
SD
RD
CD
LT
T
COM.E
UNT.E
Details
Lights during data link operation
Lights while sending data
Lights while receiving data
Lights when detecting carrier
Lights when turning “ON” the termination resistance
Lights during testing (TEST)
Lights at a communication error
(COM. E)
Lights at time up of the watchdog timer
- 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
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
Over flow of receiving buffer.
Flame length error
EEPROM error
Switch setting 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. C1(H) = 301(8) = slave station 01)
80
40
20
10
8
4
2
Measure
Cause
Replace the JW-21MN
Check the communication cable
Check the communication cable
Replace the JW-21MN
Check the switch setting
Check the parameter setting
Replace the JW-21MN
1
01
02
03
04
11
12
18
1F
20
21
22
23
2A
2B
30
*60
*6E
6F
Error
code
(DEC)
*
C1
*
FF
Check the parameter setting
Check the communication cable
and slave module
LED name
-Check the communication
cable
-
C
heck for doubled allocation
of station number
-Replace the JW-21MN
to to