Product manual

B Protocols TAC Xenta Server – Gateway, Technical Manual
130 (184) Schneider Electric Buildings AB, June 2011
04-00124-06-en
• online – Flags ONLINE during normal network communications,
and will change to OFFLINE only if communication has failed to
the master on the Modbus network. An OFFLINE condition nor-
mally indicates incorrect communication property settings, or
faulty wiring of the network between the Xenta 913 and the mas-
ter.
B.2.3 Pseudo Slave Devices
One or more pseudo devices are added to the Modbus Slave interface
node in the network pane of XBuilder, as shown for the Master pseudo
device of the XLink example network in the following screenshot.
Device Template
Device templates having a [Modbus_Int] filename prefix are used to
create Modbus Pseudo Slave devices in XBuilder. Subsequently, each
device node is used to configure its communications so that it can
appear as a physical slave to the master.
Device Properties
• Address – Allows the required slave address to be entered. The
entered number should correspond to the unique address that the
pseudo slave will respond to on the Modbus network (1 to 247).
Often only one pseudo slave will be required, although it may be
preferable to break a larger number of signals into logical groups
represented by their own pseudo slave type.
Device Status Signal
For each device the Modbus Slave driver generates a communication
status signal.
• ComsFail – Flags if the master is not communicating with the
pseudo slave. May be caused by an incorrect device address hav-
ing been entered resulting in the master not polling or writing the
pseudo slave device.
• online – Flags ONLINE during normal device communications,
and will change to OFFLINE if communications with the pseudo
slave have failed. An OFFLINE condition normally indicates an