PowerWave 2 Bus System BCMS Setup and Operation
Cntl Nr: PM375107-002
18
3.4.1
Finding New Devices on the Bus Run
During setup, the Accumulator searches the bus for new physical devices every 30 seconds.
Click
Find Device
to force an immediate search for new devices. When you are adding Tap Off Boxes,
Find Device
can save you a few seconds getting the device recognized by the Accumulator.
3.4.2
Updating Setup Information
Click
Update
to update all information including new devices and data from the points list for each
device.
Check
Auto Update
to have the Accumulator update data every (2) seconds.
Note: Turn off
Auto Update
if you are calibrating voltage or physically configuring the bus run.
Auto
Update
can clear or modify data you are entering.
3.5
Setup Tab: Identifying Devices on a Bus Run
3.5.1
Addressing on a Bus
As you add devices to the bus run, Setup assigns Modbus addresses sequentially starting at the specified
Modbus base address. The Accumulator can service up to (32) Modbus addresses on the bus run. For
example, if the Modbus base address is 64, devices are assigned addresses in sequence: 64, 65, 66, ..., up to
a maximum address of 95. There are no gaps in the address list.
The physical order of devices on a bus does not identify them:
•
The communication connections along the Bus Rail simply provide a connection into the bus;
they are of no importance in assigning addresses.
•
A device is identified by its ID and associated in Setup with a Modbus address.
•
A Tap Off Box, once identified to the Accumulator by its ID, can be plugged into any bus rail
connector and will have the same Modbus address.
Note:
If you are using the PowerWave 2 Bus System 7" Local Display, the Modbus addresses of your bus
runs have predetermined base addresses and address ranges. See section
4.4 Modbus Addresses with
Local Display
.
3.5.2
Setup Device Designations
An Accumulator can monitor (32) Modbus addresses, and each address has one of four designations:
•
INP PM
(input power monitor PCB in end feed): There will be (1)
INP PM
per power feed, if
input power source monitoring is selected, or (1) per bus run.
•
IBUS
(iBus PCB in a Tap Off Box): There is (1)
IBUS
for each Tap Off Box that has BCMS
monitoring.
•
Reserved
. A
Reserved
device takes one of the (32) address positions in the Accumulator, even
though there is no physical device for this position.
•
No Device
. A Modbus address that has no associated physical device, is available for assignment,
and is not
Reserved
. When a new physical device (Tap Off Box) is installed, the first available
No
Device
address is assigned to it. (Note: This is a Modbus
address
,
not
a physical Modbus
