Need help please! Two PLCs to sense the state of one bank of

[bauschman]

Hi Group,

I'm sure this question is beneath most of you. I got stuck to do this
circuit and I'm not the electronics guy!
I have a bank of four three position switches. The centre position is
off. The outputs are used to instruct a PLC. The problem is I need to
make another PLC aware of the state of these switches. I think that I
need to have relays to isolate the PLCs. Does any anybody have a simple
circuit design for this application. Circuit for one switch would be
fine.

Thanks

Brian

 

[Jamie]

bauschman wrote:

Hi Group,

I'm sure this question is beneath most of you. I got stuck to do this
circuit and I'm not the electronics guy!
I have a bank of four three position switches. The centre position is
off. The outputs are used to instruct a PLC. The problem is I need to
make another PLC aware of the state of these switches. I think that I
need to have relays to isolate the PLCs. Does any anybody have a simple
circuit design for this application. Circuit for one switch would be
fine.

Thanks

Brian

you should be able to simply tie the inputs together with out a

problem.
you can isolate them if you wish, i really don't think is will
make any difference.
the PLC inputs are normally always inputs at all points.

 

[bauschman]

Jamie <jamie_5_not_valid_after_5_Please@charter.net> wrote in message news:<FgmVd.2421$5b5.1062@fe07.lga>...

bauschman wrote:

Hi Group,

I'm sure this question is beneath most of you. I got stuck to do this
circuit and I'm not the electronics guy!
I have a bank of four three position switches. The centre position is
off. The outputs are used to instruct a PLC. The problem is I need to
make another PLC aware of the state of these switches. I think that I
need to have relays to isolate the PLCs. Does any anybody have a simple
circuit design for this application. Circuit for one switch would be
fine.

Thanks

Brian

you should be able to simply tie the inputs together with out a
problem.
you can isolate them if you wish, i really don't think is will
make any difference.
the PLC inputs are normally always inputs at all points.

Hi Group,

Sorry for the delay in replying, been off for a few days. Thanks for
the replys, food for thought for sure. However, I think I have found a
simple way to do this. They are two separate PLC from different
companies, with separate power supplies. I plan on using independent
switch contacts mounted on Telemecanique XB2-2 switch bodies. This way
there is no electrical connection between my PLCs, the switch will
operate both sets of contacts. What do you think?

Thanks

Bauschman

 

[Chris]

bauschman wrote:

Jamie <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:<FgmVd.2421$5b5.1062@fe07.lga>...
bauschman wrote:

Hi Group,

I'm sure this question is beneath most of you. I got stuck to do
this
circuit and I'm not the electronics guy!
I have a bank of four three position switches. The centre
position is
off. The outputs are used to instruct a PLC. The problem is I
need to
make another PLC aware of the state of these switches. I think
that I
need to have relays to isolate the PLCs. Does any anybody have a
simple
circuit design for this application. Circuit for one switch would
be
fine.

Thanks

Brian

you should be able to simply tie the inputs together with out a
problem.
you can isolate them if you wish, i really don't think is will
make any difference.
the PLC inputs are normally always inputs at all points.

Hi Group,

Sorry for the delay in replying, been off for a few days. Thanks for
the replys, food for thought for sure. However, I think I have found
a
simple way to do this. They are two separate PLC from different
companies, with separate power supplies. I plan on using independent
switch contacts mounted on Telemecanique XB2-2 switch bodies. This
way
there is no electrical connection between my PLCs, the switch will
operate both sets of contacts. What do you think?

Thanks

Bauschman

That's fine. A DPDT switch is a good idea.

Chris