Finally decided to place an order yesterday for 3off DQ860MA drivers and a 60V 10A supply (Z will use existing MD542). This is from Wantai motors and includes a BoB. I'm going to use this BoB initially and see how it goes. Whilst I'm waiting for those nice new bits to arrive, I'm thinking about upgrading the home/limit system to reduce the false e-stops which very occasionally occur. All limits & homes wire straight into the system3 board currently.

Reading around suggests:
home - proximity switches DIRECT to BoB input (for speed and accuracy)
limit - 24V system though relay then to BoB input (for reducing false e-stops and noise etc)

My question is about the 24V system. I've found a 24V 4-channel relay module board. I intend to use this for limits, probe, and two spare. Questions are:
1. It comes in 'active high' or 'active low' versions. Which one do I need? I'm guessing active low since the 24V would run through the NC switches and into the board so would be 'high' during normal running. When the switch opened the 24V circuit would be broken and go 'low'?

2. In terms of wiring this board looks like it needs 24V DC input, then the switches wire straight into the relay board without any other bits required, and the output contacts wire straight into the BoB without other bits- is this correct?

3. Is this board suitable for this or is there something better?


4-Relay Module with Optocoupler isolation High & Low Level Trigger 5v 9v 12v 24v | eBay


Thanks