Powell BriteSpot BSG3, Instruction Bulletin

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23 Installation
01.4IB.48040C
6) Connect Communication Wiring (MODBUS
TCP/IP and ETHERNET I/P)
Shielded twisted-pair 10/100 Base-T cables
(CAT5) with RJ45 connectors are supported.
Connect cable to the Ethernet port on the
device should either MODBUS TCP/IP or
ETHERNET I/P protocols be selected for
real-time communication with the device.
7) Relay Output
The device is configured with a relay that
is normally open during typical operation.
The relay contacts close when ANY of the
Alarm registers have been triggered. See
Ch 5 Usage, D. Special Registers, 2) Alarm
& Warning Registers for operation of the
Alarms. The relay contacts are found on
Terminals 9 and 10 of the “6-10” Terminal
Block.
Table F Output Relay Status
Relay Status
On (Closed) Any one channel temperature has
exceeded alarm threshold
Off (Open) All temperatures below individual
thresholds
8) Network Topologies
The following sections only pertain to the
networking and real-time data collection
of temperature data from the BriteSpot™.
This section is intended for those planning
to connect the G3 Conversion Module to a
SCADA network.
a. RS-485 MODBUS RTU Network Topology
This topology is usually referred to as
a “ring topology” in that each unit is
connected sequentially along a databus.
The flexibility of the system allows for
one databus to communicate with up
to 31 units. If more than 31 units are
required, an additional databus must be
added.
Figure 27 Typical Serial Topology for MODBUS
RTU
HMI PLC
G3 Client devices 1- 31
b. MODBUS TCP/IP and ETHERNET I/P
Network Topologies. When using either
of the Ethernet based communication
protocols (Ethernet I/P or MODBUS
TCP/IP), the topology is considered
a “star”. Each unit is typically wired
directly to the server through a network
switch as shown in Figure 27 .
Figure 28 Star Topology
10/1
00
STAT
RST
ID#:
BriteSpot
G3
BS3
BS2
BS1
LINK COM SYS
4 5 6
7 8 9
1 2 3
10/1
00
STAT RST
ID#:
BriteSpot G3
BS3
BS2
BS1
LINK COM SYS
4 5 6
7 8 9
1 2 3
Hub HMI/Server
G3 Client devices