Mitsubishi MELSEC QJ71C24, Руководство пользователя

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MELSEC-Q
11 TROUBLESHOOTING
11.3 Troubleshooting by Symptom
This following shows troubleshooting of trouble generated during communications
between the Q series C24 and external device according to the trouble symptom.
When trouble occurs, first confirm the status of the Q series C24 and check the
relevant item in the table below.
Protocol
Symptom Symptom description
Dedicated
Non
procedure
Bidirectio
nal
Pre-
defined
Reference section
•
"RUN" LED turned off. Section 11.3.1
•
"RD" does not blink even through an external device
is transmitting a message.
Section 11.3.2
•
An external device transmitted a message and "RD"
blinked, but the Q series C24 did not return a
response message. Section 11.3.3
•
"SD" does not blink even after a send request was
made.
Section 11.3.4
•
An external device transmitted a message and "RD"
blinked, but the Q series C24 did not turn ON the
read request. Section 11.3.5
•
The CPRTCL instruction is not completed even
though "RD" was blinking.
Section 11.3.6
LED turns on/off (check according to
Section 4.3)
•
ERR. LED turns on. Section 11.3.22
•
The "NAK" was turned ON. Section 11.3.7
•
The "C/N" was turned ON. Section 11.3.8
•
The "P/S" was turned ON. Section 11.3.9
•
The "PRO" was turned ON. Section 11.3.10
•
The "SIO" was turned ON. Section 11.3.11
•
The "CH1. ERR. " or "CH2. ERR. " was turned ON. Section 11.3.12
•
Communications are intermittently established and
lost.
Section 11.3.13
•
Data that cannot be decoded was transmitted and
received.
Section 11.3.14
Communication errors occurred
(check according to Section 11.1.1)
•
Whether the cause of the communications error is in
the Q series C24 or the external device is unknown.
Section 11.3.15
•
Cannot communicate via modem. Section 11.3.16 Cannot communicate via modem
(
1
)
•
Cannot communicate with ISDN sub-address. Section 11.3.17
•
Does not operate in the cycle time designated in the
constant cycle transmission setting.
Section 11.3.18 The programmable controller CPU
monitoring function does not operate
in the designated cycle time.
•
Does not operate in the cycle time designated in
condition agreement transmission setting.
Section 11.3.19
Cannot receive by an interrupt
program
•
Cannot receive data. Section 11.3.20
Cannot perform initial setting
•
Cannot write setting value in flash ROM of the Q
series C24.
Section 11.3.21
1 If an error occurs while performing data exchange using the modem function
described in User's Manual (Application), first check the following items and
confirm whether or not the error is caused by the modem/TA connection.
If an error relating to the modem function is occurring, perform necessary
corrective actions for each cause according to the reference sections given below:
• Check the ON/OFF status of current I/O signals of the Q series C24.
• Check the storage status for error codes related to the modem function. (See
Sections 11.2.3.)
• Check the ON/OFF status of the DR terminal of the modem/TA. (See the
manual for the modem/TA.)