5/25/2015 3:30 PM | |
Joined: 9/27/2006 Last visit: 9/2/2024 Posts: 12282 Rating:
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Hello; Where in the manual does it show that the Modbus server functions are limited to 4 clients? First of all, the number of available communication connections dépends on the CPU technical data, please look them up in the search Box at the right of this page. Second, Modbus TCPfunctions described in the manual allow fore multiplexing of connections to port 502 (from the manual SIMATIC Modbus/TCP Redundant Communication of PN H Systems.):
3.4 Multiple connections to port 502 General information Some CPUs can multiplex TCP connections. In these cases, multiple MODBUS clients can connect to port 502 of the CPU (multiport). The CPU acts as the MODBUS server. Information on which CPUs with which firmware versions allow multiple port 502 use is available here: Requirements For this function to be available, the following settings must be made in block selection and parameter assignment: · CPU is the server · Port 502 is the local port · Unspecified TCP connection · Passive connection establishment Number of connections enabled The number of connections that a CPU can accept at port 502 depends on the module. Please see the technical data of the CPU for details. Configuration One unique connection in the parameter DB is required for each client that is to connect to port 502 of the server. Hope this helps, Daniel Chartier |
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