6
Eaton PDI WaveStar BCMS Hub Installation and Operation Manual P-164001108—Rev 01
22..66..22
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You must be sure to stay within the Modbus limits. Figure 3 illustrates counting electrical loads and Modbus
addresses on the BCMS Hub downstream link to its devices.
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The following are examples of maximum configurations for either electrical loads or Modbus addresses:
(32) RPPs or JCOMMs each with Monitors, (2) BCMS PCBs, and (4) panelboards (Monitors are the electrical
loads):
•
(32) RPPs or JCOMMs with Monitors =
(32) Electrical Loads
(maximum)
•
(32) RPP or JCOMMs each with (1) Monitor and (4) PBs = 32 x 5 = (160) Modbus addresses
(16) RPPs or JCOMMs without Monitors, each with (2) BCMS PCBs and (4) panelboards (BCMS PCBs are the
electrical loads):
•
(2) BCMS PCBs per RPP or JCOMM: 16 RPPs/JCOMMs x 2 PCBs =
(32) Electrical Loads
(maximum)
•
(4) Panelboards per RPP or JCOMM: 16 RPPs/JCOMMs x 4 PBs = (64) Modbus addresses
(24) Bus System End Feeds with (9) Tap-Off Boxes each:
•
(24) End Feeds = (24) Electrical Loads
•
(24) Bus Runs with (10) addresses each (1 End Feed + 9 Tap-Off Boxes) =
(240) Modbus Addresses
(near
maximum)
22..66..44
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Monitors are Modbus clients on their segment and adjust the Modbus addresses of their downstream devices
based on their own address. Because the BCMS Hub is a Modbus client and Monitors downstream in RPPs or
JCOMMs are also Modbus clients on their own segments, multiple address adjustments can occur. These
address adjustments can be confusing.
On the BCMS Hub
Home
screen you have a choice of showing devices Modbus addresses as seen from the
BCMS Hub or Modbus addresses as seen from the BMS or DCIM system (assuming the BMS or DCIM is next
upstream from the Hub). Using Offset = √ on
Modbus Settings
will show addresses on the
Home
screen as
seen from the BMS. This setting is recommended because it makes it easy to coordinate Modbus addresses
between the BCMS Hub and the BMS. See paragraph
.
Summary of Contents for PDI WaveStar BCMS
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Page 52: ...44 Eaton PDI WaveStar BCMS Hub Installation and Operation Manual P 164001108 Rev 01 Glossary...
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