Appendix 1 Before Using High Function Module A1-1 To A1-2; A1.1 For Using The Eh-Cu - Hitachi HIDIC EH-150 Applications Manual

Appendix 1 Before using high function module

A1.1 For using the EH-CU

The partial operation is different on the case of using on the side of EH-CPU and the case of using on the side of EH-
IOCP.
When using EH-CU, always take care of the following attention item.
When using EH-CU on the side of EH-IOCP, the CPU stop count becomes invalid.(fixed in "countable
during CPU stopping" mode)
In using the "uncountable during CPU stopping" mode,
I n s e r t a r e l a y b e t w e e n " c o m p a r i s o n o u t p u t " o f E H - C U a n d t h e
e x t e r n a l i n p u t d e v i c e . A n d c o n t r o l t o O F F t h e r e l a y i n P L C ( t h e
P r o f i b u s - D P m a s t e r ) s t o p p i n g .
When not use, the comparison output becomes ON follows the OE flag of the control register of EH-CU
even if PLC( the Profibus-DP master) is stopping.
And initialize the current value in case of the CPU become RUN.
The example wiring when controlling the relay which was inserted among the external input
device and the comparison output of EH-CU is shown.
EH-YR12
Allocates optional one point of EH-YR12 for the external input device.
Make a circuit at the head of the ladder program to become OFF in STOP or become ON in
RUN for PLC( the Profibus-DP master).
The ladder program for EH-150 CPU is shown in the following.
REQUIRED
Sink cuurent
2mA(max)
Y*
C
Appendix 1 Before using high function module
+
Input of external device
Relay output keeps off during CPU is
stop
A 1-1
L****