Mitsubishi MELSEC LJ71C24, Руководство пользователя

Страница: 311 / 428

15 - 42 15 - 42
15 TROUBLESHOOTING
15.3.7 Communication error "NAK"
Symptom Cause Corrective action MC
Bidirectional
N
on-
procedural
Predefined
• Refer to section that
describes the
communication error
signal ("C/N", "P/S",
"PRO", "SIO") that are
turned on simultaneously
when the "NAK" signal is
turned on.
• Take corrective action corresponding to the
contents of the error.
Note
Since the error code is added to "NAK" and is transmitted from the C24 to the external device
when the "NAK" signal is turned on, take the corrective action described in the error code list
(refer to Section 15.2.2).
Since the error code added when "NAK" is transmitted is stored to the C24 buffer memory
shown below, it can also be checked at the C24.
Error code storage buffer memory address
CH1 side 25A
H
CH2 side 26A
H
• Communication error
signal "NAK" turned
on.
15.3.8 Communication error "C/N"
Symptom Cause Corrective action MC
Bidirectional
N
on-
procedural
Predefined
• PC No. designated local
station (FF), or a station
other than a station No.
set with the network
parameters.
• Change the PC No. to local station (FF), or a
station No. set with the network parameter
and restart data communications.
• Communication error
signal "C/N" turned
on.
• Routing parameters
between CPU module
with the C24 and
communication
destination CPU module
are not set.
• Check the routing parameters and set them
up to the communication destination CPU
module.