Plcm-e4

[Doddy]

Hello,

As an end-user (not of your kit - at least not yet) - can I offer some insight into the documentation provided.

To understand the interfacing requirements it would be very useful to offer equivalent-circuits in your documentation for each class of input and output.

* Opto-isolated inputs - what series resistor have you used?, what's the maximum forward current of the LED?
* Buffered outputs - what's the source/sink current capability? are the drivers open source/collector? What's the output voltage - e.g. referenced to a local 5V regulator?
* Relay outputs - what is the switching current?, AC/DC max switching voltage?
* Non-buffered inputs - what's the switching characteristics?, any pull-ups, pull-downs?, can they be left open circuit?, minimum "high" input, maximum "low" input.

The above helps a lot in trying to design around your boards - I was surprised not to be able to easily find that basic information out.