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Modbus/TCP
The gateway and the Modbus station communicate over Modbus/TCP connections. The
gateway is the active partner during connection setup.
● RTU number
RTU number of the Modbus slave
● IP address
IPv4 address of the station interface
● Port number
Port number of the station interface. Default: 502
● Connection establishment attempts
Maximum number of attempts to establish a connection to a station.
After reaching the configured number of attempts, no additional connection attempts are
made until the gateway is restarted.
Range of values: -1...32768
With "-1" the number of connection attempts is unlimited.
● Polling interval (s)
Cycle time in seconds in which the gateway reads the data from the station.
Range of values: 1...65535
● Reconnection delay (s)
Wait time (seconds) before a new connection attempt is made when the station cannot be
reached or the connection is terminated.
A wait time makes sense, for example, to wait for short-term network faults to be removed
or restart of a station.
Range of values: 0...100
● Timeout (ms)
When the gateway does not receive a response from the station within the configured
time (milliseconds), it repeats the station request.
Range of values: 100...65535
● Max. number of faulty responses
Maximum number of outstanding or faulty station responses.
When reaching the maximum number, the gateway considers the station to be faulty and
terminates the connection. When a connection is terminated, the gateway tries to re-
establish the connection.
Range of values: 1...32
● Retries
Maximum number of retries of the station query when the gateway does not receive any
or a faulty response from the station.
Range of values: 0...10
SIMATIC CC7
Operating Instructions, 10/2019, C79000-G8976-C503-02
Configuration
4.7 Process access
67
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