Mitsubishi Electric MELSEC-A User Manual page 157

16. TROUBLESHOOTING (MULTIDROP LINK FUNCTIONS)
MELSEC-A
16.2 Error Codes (Local Station)
Durina transmission between the master and slave stations amro~riate error
codesare written to buffer address 50H to define the error as'follbws:
Error
(Hexa-
04H (4)
Pretrans-
sequence
06H (6)
14H (20)
Data
sion
sequence
16H (22)
Description
During communication
with station 1
I
During cpmmunication
w ~ t h statlon 2
Any of the followin
During communication
errors has occurre8
with station
3
during pretransmission
sequence.
Initial data setting error
DIP switch setting error
Cable connection error
Data communication error
During communication
with station 8
Initial data has not been transferred from the buffer
memory to the RS-4221485 interface transmission
buffer.
During communication
with station 1
I
During communication
w ~ t h statlon 2
Any of the followin
errors has occurre2
durina data transmission
. . .
I - .
. . . . .
.
sequGnce.
.
Cabi error
D a t a communication error
unication
During communication
with station 7
During communication
with station
8
Data cannot be transferred between the buffer
memory and the RS-4221485 interface
communication buffer.
-
LED
Signal
L2 ON
Xnt ON
L3 ON
Xn2 ON
Remedy
1 Check initial data.
2 Check DIP switches.
3
t
Check slave station
power.
4 Check cable.
5{ Check terminal resistor.
1) Check the number of
FROMITO instructions.
2) Hardware fault
1) Check slave station
power.
2) Check cable
1) Check the number of
FROMITO instructions.
2) Hardware fault