jstolaruk
Lifetime Supporting Member
MW0 is memory word address 0. Rung 18 compares the counter variable (accumulated I assume) to MW0. I believe the %DRx instruction may be a drum function block. This manual on PL7 micros may provide some help:
http://paginas.fe.up.pt/~asousa/sind/schneider/PL7-Micro-Junior-Pro-Reference-Manual-vol2.pdf
http://paginas.fe.up.pt/~asousa/sind/schneider/PL7-Micro-Junior-Pro-Reference-Manual-vol2.pdf