Details Of I/O Signals - Mitsubishi MELSEC-Q series User Manual

3
SPECIFICATIONS
3.3.2
I/O signals for the Q66DA-G are explained in detail below.
(1) Input signals
Device No. Signal name
X0 Module READY
External power sup-
X7
ply READY
High resolution
X8
mode status flag
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- 22 3.3 I/O Signals for the Programmable Controller CPU

3.3.2 Details of I/O signals

Details of I/O signals
(1) When the programmable controller CPU is powered on or reset, this signal turns ON when the
initial processings in the Q66DA-G are all completed.
(2) When the Module READY (X0) signal is OFF, D/A conversion processing is not performed.
Module READY (X0) turns OFF in the following situations:
During offset/gain setting mode
When the Q66DA-G has a watchdog timer error
(1) This signal turns on 100ms after turning on the external power supply.
(2) In normal mode, when Module READY (X0) is OFF, this signal does not turn ON even if 100ms
have elapsed after turning on the external power supply.
In this case, as soon as Module READY (X0) turns ON, this signal (X7) turns ON.
(3) In Offset/gain setting mode, when Offset/gain setting mode flag (XA) is OFF, this signal does
not turn on even if 100ms have elapsed after turning ON the external power supply.
In this case, as soon as Offset/gain setting mode flag (XA) turns on, this signal (X7) turns on.
(4) D/A conversion is performed after the external power supply READY (X7) turns ON.
(5) When the external power is not supplied or has been supplied for less than 100ms, X7 is OFF
and no D/A conversion is performed.
At this time, the analog output value is "0mA/0V" regardless of other settings, and no invalid
digital value error detection or no warning output is performed.
(6) X7 might not turn ON when the external power supply does not meet the requirements shown
in the performance specifications (Refer to Table 3.1.).
(7) The following time chart shows that the external power supply is turned ON after power-on of a
programmable controller CPU.
Power supply of a
programmable
controller CPU
In normal mode :(X0)
In offset/gain
setting mode :(XA)
External power supply
External power supply
READY(X7)
(8) When performing D/A output, X0 and X7 must be ON as shown below.
Digital value
write command
X0
(1) This turns ON when in high resolution mode.
Description
ON
ON
ON
100ms
D/A conversion
is not performed
X7
OFF
ON
OFF
D/A conversion
is performed
U0\
MOVP K4000 G1