EICS
Member
I have a product that i need to time the feed rate of product delivery to a machine (for display purposes only at this stage).
i want to trigger the timer by a photocell that is sensing the product.
timing to occur from the front edge of product to the front edge of the next product there is small gap between the products, this gives a pulse on - off - On with an approx mark space ratio of 3 to 1 (3 times on longer than off)
the PE cell is a point I/O input to a 1756-L72 CPU with Version V28.
has anyone done this successfully?
i want to trigger the timer by a photocell that is sensing the product.
timing to occur from the front edge of product to the front edge of the next product there is small gap between the products, this gives a pulse on - off - On with an approx mark space ratio of 3 to 1 (3 times on longer than off)
the PE cell is a point I/O input to a 1756-L72 CPU with Version V28.
has anyone done this successfully?
- i tried to use the PE to latch a bit
- then used the latched bit in series with the PE again to drive the unlatch statement
- used a TON timer to time the duration of the latched bit