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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