User`s manual

12-16
M-net (Master Station) Function
12
12-4-3 Error code
When an error occurs on the master station during M-net communications, the error code is stored in
system memory #170 on the master station PC (JW-32CUM1). When a JW-32CUM1 is being used,
the error code will be displayed by the indicator lamps (80 to 1)on the module.
[1] Error code details
The error code contains three kinds of information in eight bits.
- Bits 0 to 7 of the error code correspond to the
indicator lamps E0 to E7 on the JW-32CUM1,
and the indicator lamps 1 to 80 on the module.
(1) Error type
(2) Station number reporting an error
(3) Setting value of switches
Bit (error code)
Indicator lamp
Details
Cause of error Treatment
Normal
Parameter
error
- Wrong switch setting on
the master station
- Wrong parameter setting
- Check the switch settings.
- Check the parameter settings.
(Number of communication bytes, num-
ber of slave stations, number of com-
munication bytes on the slave stations)
Connection
sequence
error
- No response from the
slave stations
- Different parameter set-
tings in the master and
slave stations
- More slave stations con-
nected than specified in
the parameter setting
- Check the power and communication
cables on the slave station (disconnected
or termination resistance turned OFF). If
there is a problem, replace the slave sta-
tion.
- Check both the master and slave station
parameters.
- Check the master station parameters,
number of slave stations, data transfer
speed, and the number of communication
bytes on the slave stations.
Normal
sequence
error
No response from a spe-
cific slave station
Check the power and communication
cables on the slave station (disconnected or
termination resistance turned OFF). If there
is a problem, replace the slave station.
ON
OFF
Status
Bit Lamp
Lights
ON
Goes
OFF
76
80 40
* When connecting modules manufactured by other companies, make sure that the number of link
points and transmission speed are within the standard specifications for these modules.
*
76543210
Bits
(1)
Error type
(2)
Station number
reporting an error
(3)
Switch set value
Bit (error code)
Indicator lamp
Details
Status
Bit Lamp
Lights
ON
Goes
OFF
Slave
station 01
Slave
station 02
Slave
station 03
Slave
station 04
Slave
station 05
Slave
station 06
Slave
station 07
When a connection sequence error or normal sequence
error occurs, this function indicates the number of the slave
station that has a communication error.
Master
station 00
Slave
station 01
Slave
station 02
Slave
station 03
Slave
station 04
Slave
station 05
Slave
station 06
Slave
station 07
54
20 10
3
8
ON
OFF
ON
OFF
●
○
Bit (error code)
Indicator lamp
Status
Bit Lamp
Lights
ON
Goes
OFF
Details
Slot number 0
Slot number 1
Slot number 2
Slot number 3
Slot number 4
Slot number 5
Shows the module No. switch setting values for the
master modules (JW-32CUM1, JW-21CM) on
which a "parameter error," "connection sequence
error," or "normal sequence error" has occurred.
(The JW-32CUM is fixed to "0.")
○
○
○
○
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●
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○
●
●
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○
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21
42
0
1