Product manual

B Protocols TAC Xenta Server – Gateway, Technical Manual
120 (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
all slaves 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 slave
devices.
B.1.3 Modbus Slave Device
One or more slave devices are added to the Modbus Master interface
node in the network pane of XBuilder, as shown for the “Panel” slave
device of the Modsim example network in the following screenshot.
Device Template
Device templates having a [Modbus_Ext] filename prefix are used to
create Modbus Slave devices in XBuilder. Subsequently, each device
node is used to configure communications with the physical slave it rep-
resents on the Modbus network.
Device Properties
• Address – Allows the required slave address to be entered. The
entered number should correspond to the unique address of the tar-
get slave on the Modbus network (1 to 247). An address of 0 may
be entered if the target device is a router to a Modbus network.
• Max Range Size – Sets the maximum number of registers to be
polled in a single request (1 to 100). Lower values increase the
number of messages needed to poll all the required register values,
whereas higher settings may reduce the number (if supported by
the device). Most devices support at least the default value of 20,
but a few may support less.