Details Of I/O Signals; Input Signals - Mitsubishi Electric MELSEC-Q QE81WH4W User Manual

5 I/O signal to CPU module

5.2 Details of I/O signals

Detailed explanation about I/O signals of QE81WH4W is provided as follows:

5.2.1 Input signals

(1) Module ready (Xn0)
(a) When the power of CPU module is turned on or the CPU module reset is performed, it will
turn ON as soon as the measurement is ready.
(b)This signal (Xn0) is turned OFF when energy measuring module displays a hardware error,
and RUN LED is turned off.
(2) Periodic electric energy 1 data completion flag (Xn1)
(a) When Periodic electric energy 1 measurement flag (Yn1) is turned OFF and calculation
of the periodic electric energy 1 is stopped, then this signal (Xn1) turns ON. While
calculating the periodic electric energy 1, this signal (Xn1) turns OFF.
(b) In order to acquire the data under the condition where the periodic electric energy 1 is
checked after the accumulation of the periodic electric energy is stopped, obtain the data
while this signal (Xn1) is ON.
*For specific usage procedures, refer to section 4.2.2.
(3) Periodic electric energy 2 data completion flag (Xn2)
The usage procedure is the same as Periodic electric energy 1 data completion flag (Xn1).
Refer to (2).
(4) Periodic electric energy 1 reset completion flag (Xn3)
(a) When Periodic electric energy 1 reset request (Yn3) is turned ON, and the periodic electric
energy 1 that is stored in the buffer memory is reset, then this signal (Xn3) turns ON.
*For specific usage procedures, refer to section 4.2.2.
(5) Periodic electric energy 2 reset completion flag (Xn4)
The usage procedure is the same as Periodic electric energy 1 reset completion flag (Xn3).
Refer to (4).
(6) Data acquisition clock (Xn8)
(a) After turning on the power of CPU module, the output period of data acquisition clock
counting will start by turned on this signal (Xn8) immediately after the initial operation. Then
the output period of data acquisition clock has completed writing the measurement data to
the buffer memory and this signal would be turned on at this moment. Also, if the set of input
voltage, primary current, primary voltage of VT, secondary voltage of VT, primary current of
CT and measurement data acquisition period are changed, immediately turn on and the
output period of data acquisition clock counting will start.
(b) This signal will be off after turned on for 150ms.
5 – 2
QE81WH4W