Internet PLC Forum

General => Technical support => Topic started by: mcw on March 29, 2006, 08:52:44 AM

Title: mcr on t100md-2424
Post by: mcw on March 29, 2006, 08:52:44 AM

is there any way to monitor the state of the mcr pin? i'm thinking running the pin voltage through a voltage divider into an anlog input, but maybe there is an easier way.

Thanks,

mike
balls machine & mfg

Title: Re:mcr on t100md-2424
Post by: support on March 29, 2006, 05:42:24 PM

Since the MCR input is normally high, you can connect it to an unused digital input that has a pull down resistor (1K, 1Watt) to 0V. That way, the input will normally be ON but when MCR voltage is present it is turn OFF and the PLC can therefore monitor it.

Title: Re:mcr on t100md-2424
Post by: mcw on March 30, 2006, 08:13:57 AM

Thanks for the reply.
Before I let the smoke out of something,  is it like this? --

mcr pin --> resistor --> input --> 0-vdc

or like this?

mcr pin --> input --> resistor --> 0-vdc

Title: Re:mcr on t100md-2424
Post by: support on March 30, 2006, 08:54:28 AM

mcr pin --> input --> resistor --> 0-vdc

MCR pin goes directly to the PLC input, and there is a resistor connector to the same input that pulls it to 0V when MCR voltage is absent.

Title: Re:mcr on t100md-2424
Post by: mcw on March 30, 2006, 09:02:03 AM

Thanks.

mike

Title: Re:mcr on t100md-2424
Post by: evanh on March 30, 2006, 12:42:19 PM

Code: [Select]

                             |
                              |
[Terminal]--------------------| (MCR pin)
                |             |
               _|             |
               | |            |
               | | 1k0        |
               |_|            |
                |             |
                |
                |
               \/


Title: Re:mcr on t100md-2424
Post by: evanh on March 30, 2006, 12:51:13 PM

hmm, the fixed font/code font entering isn't working too well on this site but I think you get the idea.


Evan