solve this sequence a+a-b+b-a+a-c+c-

Please solve this sequence a+a-b+b-a+a-c+c-
Either in plc or pneumatics.

You won't get any help here mate.
Post your solution first and if it's wrong then we will help...

you are forgetting the & ! and the * and the ( and )
it looks like the answer is 0

given it ends with - it is impossible to solve...

I believe his 'math looking' sequence is a statement of the actuation of cylinders. The letters identifying the cylinder and the '+' or '-' indicates the direction of actuation. But, as stated, we now await the first attempt at a solution before comment.

42?

Joan Murt said:

given it ends with - it is impossible to solve...

Click to expand...

You are not familiar with RPN.

I agree with shooter, the answer is "0".

Could he actually mean Up-Up-Down-Down-Left-Right-Left-Right, B, A, Start ?

Here's a start. It is missing a few things that should be dealt with, but you've got to make the students squirm a little.


If (Sequence_Step = 0) AND (Transition_0_to_1 = True), Sequence_Step := 1
If (Sequence_Step = 1), A+ := True, Else A+ := False
If (Sequence_Step = 1) AND (Transition_1_to_2 = True), Sequence_Step := 2
If (Sequence_Step = 2), A- := True, Else A- := False
If (Sequence_Step = 2) AND (Transition_2_to_3 = True), Sequence_Step := 3
If (Sequence_Step = 3), B+ := True, Else B+ := False
If (Sequence_Step = 3) AND (Transition_3_to_4 = True), Sequence_Step := 4
If (Sequence_Step = 4), B- := True, Else B- := False
If (Sequence_Step = 4) AND (Transition_4_to_5 = True), Sequence_Step := 5
If (Sequence_Step = 5), C+ := True, Else C+ := False
If (Sequence_Step = 5) AND (Transition_5_to_6 = True), Sequence_Step := 6
If (Sequence_Step = 6), C- := True, Else C- := False
If (Sequence_Step = 6) AND (Transition_6_to_0 = True), Sequence_Step := 0

Shift Register

Eddie Willers said:

Could he actually mean Up-Up-Down-Down-Left-Right-Left-Right, B, A, Start ?

Click to expand...

Use to be one of my favorites!!!

sometimes stuck.

left or right diffcult

Eddie Willers said:

Could he actually mean Up-Up-Down-Down-Left-Right-Left-Right, B, A, Start ?

Click to expand...

isn't it Up-Up-Down-Down-Left-Right-Left-Right, B, A, Select Start?

DamianInRochester said:

42?

Click to expand...

I'd love being able to vote just to give you not a 10 but a 100!