Sorry for the delay in answering, just got back off my holidays.
Of course you are all correct regarding 'hiding away information' by PM's, this was unintentional and only done because I was PM'ed about it.
So here is the explanation of the logic example given.
First rung
On a rising edge input X001 moves 1 into k2Y000, in effect turning on Y000 for one scan (K2Y000 references 2 x Nybbles = 2 x 4bits = Y000 to Y007)
Rung 2
If Y000 is true Set Internal flag M20 - this selects shift left register
Rung 3
If Y007 is true Reset Internal flag M20 - this selects shift right register
rung 4
If M20 True then increment the shift register via rising edge of system flag M8012 (100mS clock pulse)
the shift register breakdown is as follows:- [SFTL Shift left instruction
[M1 dummy flag
[Y000 first bit in shift register
[K8 number of bits in shift register
[K1 number of bits to shift
rung 5
If M20 False then increment the shift register via rising edge of system flag M8012 (100mS clock pulse)
the shift register breakdown is as follows:- [SFTR Shift Right instruction
[M1 dummy flag
[Y000 first bit in shift register
[K8 number of bits in shift
[K1 number of bits to shift
When Output Y007 turns on it activates the shift right register by turning off M20, this then shifts
the state of Y007 rightwards toward y000, until Y000 is reached making M20 true, starting the shift left once more.
Rung 6
when input x001 activated it moves zero onto output byte Y000 to Y007 (K2Y000 2xnybbles = 2x4bits = Y000 to y007)
Hope this helps
Just bear in mind this was only a quick off the top of my head example
Steve
Of course you are all correct regarding 'hiding away information' by PM's, this was unintentional and only done because I was PM'ed about it.
So here is the explanation of the logic example given.
First rung
On a rising edge input X001 moves 1 into k2Y000, in effect turning on Y000 for one scan (K2Y000 references 2 x Nybbles = 2 x 4bits = Y000 to Y007)
Rung 2
If Y000 is true Set Internal flag M20 - this selects shift left register
Rung 3
If Y007 is true Reset Internal flag M20 - this selects shift right register
rung 4
If M20 True then increment the shift register via rising edge of system flag M8012 (100mS clock pulse)
the shift register breakdown is as follows:- [SFTL Shift left instruction
[M1 dummy flag
[Y000 first bit in shift register
[K8 number of bits in shift register
[K1 number of bits to shift
rung 5
If M20 False then increment the shift register via rising edge of system flag M8012 (100mS clock pulse)
the shift register breakdown is as follows:- [SFTR Shift Right instruction
[M1 dummy flag
[Y000 first bit in shift register
[K8 number of bits in shift
[K1 number of bits to shift
When Output Y007 turns on it activates the shift right register by turning off M20, this then shifts
the state of Y007 rightwards toward y000, until Y000 is reached making M20 true, starting the shift left once more.
Rung 6
when input x001 activated it moves zero onto output byte Y000 to Y007 (K2Y000 2xnybbles = 2x4bits = Y000 to y007)
Hope this helps
Just bear in mind this was only a quick off the top of my head example
Steve
