Maximum number of MODBUS TCP slaves with Freelance
We're thinking about using MODBUS TCP with Freelance AC 800F controllers.
As per the Freelance fieldbus manual, the MODTCP_M block parameters contain a single slave address field. It also says that a maximum of 10 MODTCP_M blocks per interface can be used.
Does this mean I can only address 10 slaves over MODBUS TCP, or have I misread anything?
(That's quite a small number for a field bus; Profibus DP can cope with more than ten times as many.)
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The documentation is not exact here. The limitation is per controller, not per interface, and every Ethernet device block counts.
AC900 supports up to 20.
We have got requests to increase the limit.