HONEYWELL 05701-A-0326 module regulator

HONEYWELL 05701-A-0326 module regulator

Technical data of product parameters

Port 502 is reserved for the Modicon Open TCP 05701-A-0326 Modbus protocol. The Slave port should be
set to 502 if this protocol is to be used. This protocol is only available as a Modbus Slave.
The settings above relate to each individual Slave. The following settings are common to the 05701-A-0326
operation of Modbus Slaves.
3.4.1. Connection Timeout
‘Connection Timeout’ should be left at the default of ‘Disconnect after 300 seconds’. This
allows Ethernet based Slaves to recover properly after a lost connection. 300 seconds is
appropriate for communications where cable breaks are not normally expected (e.g. not
involving a modem or other link likely to disconnect).
The TCP/IP stack does not detect the loss of Modbus communications caused by a pulled 05701-A-0326
connection or cable break. A broken connection will not be seen by the TCP/IP stack, and
will be retained as a valid connection. When the broken connection is recovered, the
Modbus Master may resume communications using the existing connection, but it is more
likely to establish a new connection. Each re-connection consumes one of the available
connections. If this occurs on a regular basis, all the available connections will be consumed 05701-A-0326
and no further connection will be possible. On early CIs that do not recognise the
connection timeout setting, removing and re-inserting the CI and rebooting it will recover
the available connections.
3.4.2. SOE over Modbus
The SOE over Modbus protocol allows buffered transfer of events via a CI Modbus Slave.
This protocol provides access to the SOE buffer events (but not Process Historian), over a
Modbus data link, for where the default OPC server/SOE collector protocols prove too slow.
However, SOE over Modbus protocol requires an application in the Modbus Master (remote

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