494
APPENDICES APPENDIX
Appendix 2 Input/Output Signal List
Input signals
*1 The device does not turn ON/OFF by executing a dedicated instruction when using a function that corresponds to the input signal.
*2 The device turns ON/OFF by executing a dedicated instruction when using a function that corresponds to the input signal.
(ONOFF: Data read completion)
*3 The 'CH Switching mode' (X6/XD) turns ON when the following function is performed.
Mode switching, transmission sequence initialization, reception data clear (by buffer memory), user frame use enable/disable
designation, UINI instruction, programmable controller CPU information clear
While the 'CH Switching mode' (X6/XD) is ON, do not issue a communication request to a target interface.
(The transmission/reception processing of C24 is stopped while the 'CH Switching mode' (X6/XD) is ON.)
*4 'Predefined protocol ready' (X1D) is a signal that turns ON when predefined protocol communication becomes ready.
*5 Module READY is a signal that sends a signal of the applicability of accessing to C24 from the CPU module.
Use it as an interlock signal for a program.
*6 Restart the CPU module when the watchdog timer error is turned ON.
If the error still occurs after restarting, refer to the following section and take corrective actions.
Page 463 RUN LED turns OFF
Device number Signal name Reference
X0
*1
CH1 Transmission normal completion
X1
*1
CH1 Transmission abnormal completion
X2
*1
CH1 Transmission processing
X3
*2
CH1 Reception data read request Page 53 Receiving Data from Target
Device
Page 87 Receiving Data from Target
Device
X4
*2
CH1 Reception abnormal detection
X5 CH1 Protocol execution completion
X6
*3
CH1 Switching mode Page 377 SWITCHING THE MODE
AFTER STARTING
X7
*1
CH2 Transmission normal completion
X8
*1
CH2 Transmission abnormal completion
X9
*1
CH2 Transmission processing
XA
*2
CH2 Reception data read request Page 53 Receiving Data from Target
Device
Page 87 Receiving Data from Target
Device
XB
*2
CH2 Reception abnormal detection
XC CH2 Protocol execution completion
XD
*3
CH2 Switching mode Page 377 SWITCHING THE MODE
AFTER STARTING
XE CH1 Error occurrence
XF CH2 Error occurrence
X10 Modem initialization completion Page 160 List of input/output signals for
the modem function
X11 Dialing
X12 Connection
X13 Initialization/connection abnormal completion
X14 Modem disconnection completion
X15 to X16 Use prohibited
X17
*1
User frame read completion from flash ROM
X18
*1
User frame write completion from flash ROM
X19 Use prohibited
X1A CH1 Global signal MELSEC Communication Protocol
Reference Manual
X1B CH2 Global signal
X1C Parameter initialization completion
X1D
*4
Predefined protocol ready Page 48 Execution Condition of
Predefined Protocol Communication
X1E
*5
Module READY
X1F
*6
Watchdog timer error
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