Registers Format
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15
3.4 Relay Output
The ACL-7225 contains two types of relays: Form C and Form A. The
relay R0 ~ R4 and R9 ~ R12 are form C relays, and R5 ~ R7 and R13 ~
R15 are form A type. The difference between these two types of relay
are :
1. Form C Relays: (R0 ~ R4 and R9 ~ R12)
NO
NC
CM
Control Bit = High (1)
NO
NC
CM
Control Bit = Low (0)
Form C relay has three contacts: NC ( Normal Close), NO ( Normal
Open), and CM( Common). The COM post, located at the middle, can
make contact either NO post or NC post. When the control bit is high (1),
the CM post and NO post are contacted. If the control bit is low (0), the
CM post and NC post make contact.
In normal power-up and reset, the relay is in
low
status.
2. Form A Relays: (R5 ~ R7 and R13 ~ R15)
NO
CM
Control Bit = High (1)
NO
CM
Control Bit = Low (0)
Form A relay only has two contacts : NC ( Normal Close) and
CM( Common). The CM pos t can make contact either NO post or not
contact NO post. When the control bit is high (1), the CM post and NO
post are contacted. If the control bit is low (0), the CM post and NO post
does not make contact. Under normal power-up and reset, the relay is
in
low
status.