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Advanced Math Functions. MAIN 222 Industrial Controllers. 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

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advanced math functions

Advanced Math Functions

MAIN 222

Industrial Controllers

zcl and mcr
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

slide3
Jump
  • Jump Command is similar to ZCL
    • 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
mrc jump handout
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
blocks
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
add integers
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
using add integers parking lot example
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?
data types
Data Types
  • WE can compare, add and move a lot of different types of data. Here is a small list
  • INT a number either + - -32768 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
greater than less than
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