3SPECIFICATIONS

3.3.2 Details of I/O signals

MELSEC-Q

I/O signals for the A/D converter modules are explained in detail below.

(1) Input signals

Device No.

Signal Name

 

 

 

 

 

 

 

 

 

 

Description

 

 

 

(1) When the PLC CPU is powered on or reset, this signal turns on once the

 

 

 

preparation for A/D conversion has been completed, and A/D conversion

 

 

 

processing is then performed.

 

X0

Module READY

(2) When the Module READY signal is off, A/D conversion processing is not performed.

 

 

 

Module READY (X0) turns off in the following situations:

 

 

 

 

• During offset/gain setting mode

 

 

 

 

• When the A/D converter module has a watchdog timer error

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X1

Temperature drift

(1) When A/D conversion processing is being performed with the temperature drift

compensation flag

 

compensation function on, the flag indicating temperature drift compensation status

 

 

(X1) turns ON.

 

 

 

 

 

X8

High resolution

(1)

This turns ON when in high resolution mode.

 

mode status flag

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

This is used as an interlock condition for turning the operating condition setting

 

 

 

request (Y9) ON/OFF when the setting for A/D conversion enable/disable (buffer

 

 

 

memory address 0: Un\G0) is changed.

 

 

 

(2) When the operating condition setting completed flag (X9) is OFF, A/D conversion

 

 

 

processing is not performed. Under the following conditions, the operating condition

 

 

 

setting completed flag (X9) turns OFF.

 

 

 

 

• When Module READY (X0) is OFF

 

 

 

 

• When operating condition setting request (Y9) is ON

 

 

Operating

 

 

 

 

 

 

 

 

 

 

Performed by the A/D converter module

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Performed by the sequence program

 

 

 

 

 

 

 

 

 

 

 

X9

condition setting

 

 

 

 

 

 

 

 

 

 

 

 

 

completed flag

 

Module READY (X0)

 

 

 

 

Operating condition

 

 

 

 

setting completed (X9)

 

 

 

 

Operating condition

 

 

 

 

change request (Y9)

 

A/D conversion completed (XE)

1 A watchdog timer error occurs when the program calculations are not completed within the scheduled time due to malfunctions of A/D converter module hardware. When a watchdog timer error occurs, the RUN LED for the A/D converter module turns off.

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Mitsubishi Electronics Q68ADI, Q68ADV, Q64AD Details of I/O signals, Input signals, Condition setting Completed flag

Q68ADV, Q68ADI, Q64AD specifications

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