rsdoran
Lifetime Supporting Member
I do not know why but I thought an AB timer would accumulate time beyond the preset value, got any idea why I thought that?
I just hooked up an old L30 with a flip flop (flasher) program in it and naturally the timers are going to preset then stop accumulating and setting the DN bit.
Sometimes I just have to connect to different plc's to verify what I think is correct, dealing with so many different brands and models I get confused, get confused much easier these days too. I do not work on anything on a daily basis though.
Tomorrow will be a connect to everything I have and look at different things, having a problem with a 90-30 anyway.
As mentioned in another thread there can be things that can bite you in the arse if your not aware or forget about them. One example is AD (Koyo) has memory ranges that are retentive by default, this can cause issues.
Anyway, if you think of any of those "quirks" of the plc's you deal with then please tell about them. This could also be things about communication connections or wiring, anything that could bite ya in the arse per se.
Example: Never connect an SLC fixed 500, 5/01, 02, with an Ethernet cable to your Ethernet port. The ports are DH485 and use an RJ45 connector i.e. NOT ETHERNET
I just hooked up an old L30 with a flip flop (flasher) program in it and naturally the timers are going to preset then stop accumulating and setting the DN bit.
Sometimes I just have to connect to different plc's to verify what I think is correct, dealing with so many different brands and models I get confused, get confused much easier these days too. I do not work on anything on a daily basis though.
Tomorrow will be a connect to everything I have and look at different things, having a problem with a 90-30 anyway.
As mentioned in another thread there can be things that can bite you in the arse if your not aware or forget about them. One example is AD (Koyo) has memory ranges that are retentive by default, this can cause issues.
Anyway, if you think of any of those "quirks" of the plc's you deal with then please tell about them. This could also be things about communication connections or wiring, anything that could bite ya in the arse per se.
Example: Never connect an SLC fixed 500, 5/01, 02, with an Ethernet cable to your Ethernet port. The ports are DH485 and use an RJ45 connector i.e. NOT ETHERNET