8.4 The Instruction Set
The VersaMax PLC CPU provides a powerful Instruction Set for building application
programs.
As a guide to the programming capabilities of the VersaMax PLC, all of the relays, coils,
functions, and other elements of the Instruction Set are summarized on the following
pages. Complete reference information is included in the documentation and online help
for the programming software.
8.4.1 Contacts
–| |– Normally Open Passes power if the associated reference is ON.
–|/|– Normally Closed Passes power if the associated reference is OFF.
<+>–––
Continuation Passes power to the right if the preceding continuation coil is set ON.
8.4.2 Coils
–( )– Normally Open
Sets the associated reference ON if the coil receives power.
Otherwise OFF.
–(/)– Negated
Sets the associated discrete reference ON if the coil does not receive
power. Otherwise OFF.
–(□)–
Positive
Transition
If power flow was OFF to this coil the last time it was executed and is
ON this time, then the coil is turned ON. Otherwise, the coil is turned
OFF.
–(□)–
Negative
Transition
If power flow was ON to this coil the last time it was executed and is
OFF this time, then the coil is turned ON. Otherwise, the coil is turned
OFF.
–(S)–
SET
Sets the associated discrete reference ON if the coil receives power. It
remains set until reset by an –(R)– coil.
–(R)–
RESET
Sets the associated discrete reference OFF if the coil receives power.
It remains reset until set by an –(S)– coil.
–(SM)–
Retentive SET
Sets the associated reference is set ON if the coil receives power. The
reference remains set until reset by an –(RM)– coil. Its state is
retained through power failure and STOPTORUN transition.
–(RM)–
Retentive RESET
Resets the associated discrete reference OFF if the coil receives
power. The reference remains reset until set by an –(SM)– coil. Its
state is retained through power failure and STOPTORUN transition.
–(/M)–
Negated
Retentive
Sets the associated discrete reference ON if the coil does not receive
power. The state is retained through power failure and STOPTORUN
transition. Otherwise OFF.
–(M)–
Retentive
Sets the associated discrete reference ON if the coil receives power.
The state is retained through power failure and STOPTORUN
transition. Otherwise OFF.
–––<+>
Continuation
If power to the coil is ON, the continuation coil sets the next
continuation contact ON. If power is OFF, the continuation coil sets the
next continuation contact OFF.
Elements of an Application Program GFK-1503E User Manual 107
For public disclosure
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