Hello,
I am using PL7-1 and PL7-2 with a TSX 17-20 for experimental and demonstration purposes. I've just began the practical PLC programming.

Could someone explain me the exact functionning of the instructions =, =N, S, R, H, if applied to timers, please! (I mean which instruction or condition writes/reads which input/output...)
Do their meaning depend on the result of the last operation?
Are there any instruction mnemonics or sequences to set/reset separately the C and E timer inputs, and to read separately the D and R outputs?

If I want to avoid graphical representation languages, can I use mnemonic language with PL7-2?

Thanx

 

For PL7-1 the operation codes related to timers are:

= -> Start on state 1 and run while condition = 1

= N -> Start on state 0 and run while condition = 0

S -> Start on state 1, run until timed out

R -> initialize timer

H -> freezes (halts) timer if at state 1