16.07.2015, 08:21
I'm looking for distributed IO modules for my logicMachine.
Modbus RTU devices/RS485 seems to be the obvious choice, but this has a quite high latency because of the polling nature of Modbus?
Also, there is a 1-wire module with 2 input/outputs.
I like the devices since you can configure input/output analog/digital as you like.
But latency is a big drawback.
For a lightswitch you need millisecond latency, not seconds.
Would Modbus TCP be better? Easier distribution since the backbone network is already in the house and there can be a lot more connected clients without hardware speed problems?
Is there a direct Ethernet/TCPIP IO device that work together with logicmachine? (Din rail mounted)
Another option would be Arduino with ethernet, this should work just fine together with logicmachine? But prototype design is not preferred inside electrical cabinets.
KNX is OK for high load outputs, but low level outputs and inputs is way to costly and bulky.
Modbus RTU devices/RS485 seems to be the obvious choice, but this has a quite high latency because of the polling nature of Modbus?
Also, there is a 1-wire module with 2 input/outputs.
I like the devices since you can configure input/output analog/digital as you like.
But latency is a big drawback.
For a lightswitch you need millisecond latency, not seconds.
Would Modbus TCP be better? Easier distribution since the backbone network is already in the house and there can be a lot more connected clients without hardware speed problems?
Is there a direct Ethernet/TCPIP IO device that work together with logicmachine? (Din rail mounted)
Another option would be Arduino with ethernet, this should work just fine together with logicmachine? But prototype design is not preferred inside electrical cabinets.
KNX is OK for high load outputs, but low level outputs and inputs is way to costly and bulky.
