Configuring communication between ASi Gateway and Freelance AC900F via Modbus
I am trying to use an ASi gateway to communicate with valves in Freelance using AC900F. Can someone you guide me in setting this up?
1. I am unsure whether to use the ASi gateway as a master or a slave.
2. The gateway is supposed to send 2 separate signals as feeback for open/close and recieve one signal as command to open/close. How can I do the coil assignments for this?
In principle it doesn't matter whether the Gateway is Modbus Master or Slave, because the AC 900F can be both. But in a straight forward approach the AC 900F would be the Master.
The coil addresses should be consecutive so you can read them with one function block. The address start is a parameter of the coil read function block in AC 900F.
How to configure the coil addresses and the mapping from the ASi bus to Modbus should be part of the gateway documentation.