1. Advanced Math Functions
MAIN 222
Industrial Controllers
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2. ZCL and MCR Zone Control Logic or Master Control Relays.
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 a an end ZCL zone
This is designated as a Label
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3. Jump Jump Command is similar to ZCL 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 models products ect.
Jump commands must to addressed
A name must be associated
There must be an end jump called a 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
The Label must match its name with the same jump command
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4. 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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5. 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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6. 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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7. 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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8. Data Types
WE can compare, add and move a lot of different types of data. Here is a small list
INT a number either to + 32,767
DINT double precision stored in 2 conseq. 16 bit data locations -2,147,483,648 to 2,147,483,647
BCD
Real floating point
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9. Greater Than Less Than
Gives the ability to evaluate if one input is larger than another
See handouts
Note how outputs are on verse off
Can compare any type of data not just switches
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