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5
Programming
The Logicmaster 90-70 software is also used to create the
Relay Ladder Logic GMR application program. An
example screen of logic during edit is shown below. The
top of the Logicmaster screen always shows the current
assignments of the function keys, which are used to select
program functions. For example, on the program editing
screen illustrated below, the second row shows Contacts.
Each Contact can be selected with one key press. The
status information at the bottom of the screen can be
turned off for even more program display area.
Function Blocks for Complex Functions
Function blocks simplify programming complex functions
in the GMR application program using Relay Ladder
Logic. Multiple parameters are easily included in a
function block, in a clearly-understood fashion. The
illustration screen below shows two Addition function
blocks.
Example Function Block
Example Relay Logic with Contacts
The Series 90-70 PLC provides a large and extremely
versatile set of coils, contacts, relational functions, logical
functions, and many advanced functions for use in the
application program. They are described in the table that
begins on page 5-10.
For more complex function blocks, a ZOOM feature
opens a window on the instruction.
The same application program is used for each GMR
PLC, eliminating the need for individual logic programs
and simplifying user programming.
Application programming assistance is available from
your GE Fanuc sales office, or GE Fanuc’s 24 hour
support hotline @ 804 978–5747.
Through Logicmaster 90, the GMR CPU supports
structured programming techniques. Program logic can
be separated by functionality, equipment areas, or other
logical sections. The GMR programmer may write an
efficient program with reduced effort using structured
programming tools, which include:
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5-4
Function Blocks for complex functions
Custom Parameterized Subroutine Blocks
Program Blocks
Genius® Modular Redundancy Flexible Triple Modular Redundant (TMR)
System Technical Product Overview – February 1998
GFT-177A