8.6.5

Non procedure monitor/test .............................................................................................................

8-41

8.6.6

Bidirectional monitor.........................................................................................................................

8-43

8.6.7 PLC CPU monitoring monitor ..........................................................................................................

8-44

8.6.8

Transmission user frame No. designation monitor .........................................................................

8-46

8.6.9

Monitor/test others............................................................................................................................

8-47

8.6.10

Display LED off and communication error information/error code initialization ...........................

8-49

8.7 Non Procedure Protocol Receive Data Clear ........................................................................................

8-51

 

 

9 DEDICATED INSTRUCTIONS

9- 1 to 9-21

9.1

Dedicated Instruction List........................................................................................................................

9-

1

9.2 ONDEMAND Instruction .........................................................................................................................

9- 2

9.3 OUTPUT Instruction................................................................................................................................

9- 5

9.4

INPUT Instruction....................................................................................................................................

9-

8

9.5

BIDOUT Instruction.................................................................................................................................

9-11

9.6

BIDIN Instruction.....................................................................................................................................

9-14

9.7 SPBUSY Instruction................................................................................................................................

9-17

9.8 CSET (Receive data clear).....................................................................................................................

9-19

 

 

10 TROUBLESHOOTING

10- 1 to 10-43

10.1 Checking the Status of the Serial Communication Module...............................................................

10- 1

10.1.1

Checking the LED ON status, communications error status, and switch setting status of

 

 

 

 

the serial communication module................................................................................................

10- 1

10.1.2

Initializing error information of the serial communication module...............................................

10-

6

10.1.3

Reading the RS-232 control signal status...................................................................................

10-

9

10.1.4 Reading the data communication status (Transmission sequence status) ...............................

10-10

10.1.5

Reading the switch setting status ................................................................................................

10-11

10.1.6

How to read the current operation status ....................................................................................

10-13

10.2 Error Code Tables...............................................................................................................................

10-15

10.2.1

Error code table............................................................................................................................

10-15

10.2.2 A compatible 1C frame communications error code table..........................................................

10-24

10.2.3

Error code list while modem function is used..............................................................................

10-25

10.3 Troubleshooting by Symptom.............................................................................................................

10-27

10.3.1 Troubleshooting when "RUN" LED is turned OFF......................................................................

10-29

10.3.2 Troubleshooting when "RD" LED does not blink even though an external device is

 

 

 

 

 

transmitting a message................................................................................................................

10-30

10.3.3 Troubleshooting when the Q series C24 does not return a response message even

 

 

 

 

 

though an external device transmitted a message and the "RD" LED blinked..........................

10-31

10.3.4 Troubleshooting when an external device transmitted a message and "RD" LED blinked,

 

 

 

 

but the Read Request signal was not turned ON .......................................................................

10-32

10.3.5 Troubleshooting when communication error "NAK" generates..................................................

10-33

10.3.6 Troubleshooting when communication error "C/N" generates ...................................................

10-33

10.3.7 Troubleshooting when communication error "P/S" generates....................................................

10-34

10.3.8 Troubleshooting when communication error "PRO." generates.................................................

10-35

10.3.9 Troubleshooting when communication error "SIO" generates ...................................................

10-36

10.3.10 Troubleshooting when communication error "CH1 ERR.", "CH2 ERR." generate..................

10-37

10.3.11 Troubleshooting when communications is intermittently established and lost ........................

10-38

10.3.12 Troubleshooting when data that cannot be decoded is transmitted and received ..................

10-39

A - 10

 

 

A - 10