GE Integers, ZCL, Jump Commands MAIN 222 Industrial Controllers 1/2/2019

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 1/2/2019

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 1/2/2019

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 1/2/2019

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 1/2/2019

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 1/2/2019

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. 1/2/2019

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 1/2/2019

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? 1/2/2019