Viking03a
Member
A bit off the main highway question....
Even though I am in the middle of a monster project on
a system with Modicon Quantum 324 processor, much momentum i/o,
lexium servo drives, robot drives. and good gracious only
know what else is in th e project,,, I somehow come home in the
evening and play with an old SLC5/04 and a bunch of remote I/O
and flex I/O which is going to kinda keep up with the ol homestead
here...A toy from the junk piles of industry....
Now part of this project with the remote DC I/O is to control
to some extent a small HO gauge train layout, so that part of the
lay out can operate its normal freight routes automatically...
AS I said a "TOY"... But this toy is also a great learning
application... and one day hope to have intellutions as the
engineer to track system interface.... nope not rich, just a
junk collector....
Now that we have a bit of background presented... The question IS:
Since I have scrounged this from junkpiles, I have not had the
good fortune to find an analog output module for the SLC chasis..
I need to vary a DC voltage to accelerate the engines, and not
just turn the power on and let it rip.... With an analog module
I could set the ramp up time, and get a great acceleration curve.
And do the same thing, and get a nice decel curve... but a resister
switched into the circuit will work for the decel...
Now do I put a resister and big cap across a couple of outputs
to generate the acceleration curve to a full run voltage, """or"""
has someone got a "pulse width modulation" routine tucked up
their sleave somewhere that could be programmed into a SCR dc output
which then would drive a electrolytic cap to give a good smooth
curve....
Or can anyonme give me any other ideas... varying the frequency
of the output into the cap would also do it, but there again
a sweep generator would have to be written into the SLC.....
As a last resort, I will run out to the shop, grab some electronic
parts, and PC board, and build a sawtooth generator to give me
one nice sawtooth to accelerate the engine from a dead stop....
and simply use the PLC to turn it on and off....
As we build the new system. optical switchs and prox switchs are
being build in to control points to tell the system where things are
on the tracks....amazing what folks throw away.... Difused optical
switch mounted in station.. train comes into station, switch sees train,
train stops, passengers get off, and train pulls out of station when timer times out....
Actually as I think about it, a driver for some type of heater
control probably would give the PWM output....
I toss all this out for thought... What can we come up with....
Tim Jones
Conyers, Georgia
[email protected]
Even though I am in the middle of a monster project on
a system with Modicon Quantum 324 processor, much momentum i/o,
lexium servo drives, robot drives. and good gracious only
know what else is in th e project,,, I somehow come home in the
evening and play with an old SLC5/04 and a bunch of remote I/O
and flex I/O which is going to kinda keep up with the ol homestead
here...A toy from the junk piles of industry....
Now part of this project with the remote DC I/O is to control
to some extent a small HO gauge train layout, so that part of the
lay out can operate its normal freight routes automatically...
AS I said a "TOY"... But this toy is also a great learning
application... and one day hope to have intellutions as the
engineer to track system interface.... nope not rich, just a
junk collector....
Now that we have a bit of background presented... The question IS:
Since I have scrounged this from junkpiles, I have not had the
good fortune to find an analog output module for the SLC chasis..
I need to vary a DC voltage to accelerate the engines, and not
just turn the power on and let it rip.... With an analog module
I could set the ramp up time, and get a great acceleration curve.
And do the same thing, and get a nice decel curve... but a resister
switched into the circuit will work for the decel...
Now do I put a resister and big cap across a couple of outputs
to generate the acceleration curve to a full run voltage, """or"""
has someone got a "pulse width modulation" routine tucked up
their sleave somewhere that could be programmed into a SCR dc output
which then would drive a electrolytic cap to give a good smooth
curve....
Or can anyonme give me any other ideas... varying the frequency
of the output into the cap would also do it, but there again
a sweep generator would have to be written into the SLC.....
As a last resort, I will run out to the shop, grab some electronic
parts, and PC board, and build a sawtooth generator to give me
one nice sawtooth to accelerate the engine from a dead stop....
and simply use the PLC to turn it on and off....
As we build the new system. optical switchs and prox switchs are
being build in to control points to tell the system where things are
on the tracks....amazing what folks throw away.... Difused optical
switch mounted in station.. train comes into station, switch sees train,
train stops, passengers get off, and train pulls out of station when timer times out....
Actually as I think about it, a driver for some type of heater
control probably would give the PWM output....
I toss all this out for thought... What can we come up with....
Tim Jones
Conyers, Georgia
[email protected]