1. GE Integers, ZCL, Jump Commands
MAIN 222
Industrial Controllers
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2. Jump and MCR sometimes known as a ZCL
Master Control Relay aka Zone Control Logic.
Used in pairs to create a zone. Nonretentive outputs can be turned off
Retentive Outputs will retain their state.
Thus –()- output will go low and –(/)- will actually have an output on
Drives all of the logic in between zone high even though power is “turned off”
Safety issue maintains contacts without energizing them
Works only in the forward direction
Must have an end MCR zone
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3. Examples of MCR Classic Examples include:
Holding a PLC until a recipe loads
Waiting for an action at a prior point of a system to complete then continue
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4. Jump Jump Command is similar to MCR Jump commands must to addressed
However, Jump completely jumps through a section of programming
We can have multiple programs functioning and only let one function
Different from an MCR logic will not execute with negative logic. (see examples from Lab)
Jump commands must to addressed
A name must be associated with a Label
Each Jump must have the same name as its label
There must be an end jump LABEL
There has to be an area of the jump to get to
However, it can be forwards or backwards combatable
Can be multiple jumps
Jump verse Jumpn
Are the same function except jumpn is more used for all GE types
Jump seems to be used for more advanced GE series PLCs
Jumpn means jump within a nested PLC logic
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5. MRC JUMP Handout Notice MCR and ENDMCR EXECUTE without power
MCR has not outputs
Jump needs a label
The label corresponds to the jump command
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6. BLOCKS Blocks are the PLC logic
GE uses blocks to identify a written logic area
Notice on the right hand side of software package there is a block
It is one section that makes up the file of the program you are writing
We can use a multitude of blocks to do accomplish a lot
Example: Trimming assembly
Block one drives the conveyor system
Block two drives the cutting sequences
Block three drives raw material tanks and goods bins
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7. Always on function
The always on function is a necessity for the 90micro PLCs.
It is for the Counter and Timer Operations
It is not necessary for the GE ADD MOVE or COMPARE functions though it will not hurt if they are in either.
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8. Add Integers
This command will add two integers, numbers and places the stored value in Q
In example from handout
%I1 causes %R2 to increment up 1
It is added to %R2
The output is %R3
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9. Using Add Integers Parking Lot Example
Using the up down counter was ok in solving the problem. Ok it was all that we had
Using 1 address %R1 we can increment up or down
To do this we need to initially set the
IN 2
Why is IN 2 set the way it is?
Notice the Full Parking Light is on when what condition occurs?
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