A Step Relay is the basic component in the Sequential Function Chart (SFC) or Step Ladder (STL). The identifier number
of a Step Relay S uses the decimal method, and the functions can be divided into four different types:
(1) Initial Step Relay
It is used in the initial status of the Sequential Function Chart .
(2) General Step Relay
It is for general use in the Sequential Function Chart. When power cut off occurs during PLC operation, the status will
be reverted to void (OFF).
(3) Latched Step Relay
When power cut off occurs during PLC operation, the status will be retained. When the power resumes, PLC can
continue its work from the Latched Step Relay.
(4) Annunciator Step Relay
The annunciator with latched function. It is mainly driven by the ANS (FNC46) instruction as a contact of the
annunciator, used to record the relevant warning messages to facilitate troubleshooting.
S0~S9, 10 Pt.
S10~S499, S1500~S4095
Tot.= 3086 Pt.
S500 S899 S1000 S1499 ~ , ~
Tot.= 900 Pt.
S900 S999 100 Pt.~ ,
The Step Relays in the VS1, VS2, VSM and VS3 series share exactly the same ranges.
19
2-4 Step Relay (S)
Initial Step Relay General Step Relay Latched Step Relay Annunciator Step Relay
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