Belkin F5U104-EU-F Manual de usuario descargar pdf (Pagina 7)

EXCEL WEB CONTROL SYSTEM – NETWORKING WHITE PAPER

- 7 - EN2B0396GE51 R1214

• Agree on common network number for BACnet/IP

• Agree on Time Master Functionality (typically this is

one BACnet front-end) and the time

synchronization method, i.e. Standard or UTC (UTC

stands for Universal Time Code and includes time

zone information).

• Make BACnet traffic estimation, based on number

of points and refresh rate of these points on the

BACnet front-end.

• Agree on a common BACnet/network disgnostic

tool to be used by all vendors and be the customer.

(Typically this could be the Cimetrics “bas-o-matic”

tool or “wireshark” (recommended).

Check which BACnet clients are used for checking

and troubleshooting, e.g. Cimetrics “BACnet

Explorer”, Cimetrics “OPC Server”)

9) Agree on naming conventions for BACnet devices

• A BACnet device is either a BACnet client (e.g. EBI,

SymmetrE or 3

party front-end like Siemens

Desigo), or a BACnet server like Excel Web or 3

• Allocate unique device names.

party like Siemens PXC controllers.

• Allocate BACnet Device IDs to every vendor.

These could be based on the IP address range for

instance.

For Excel Web the Device ID equals the controller

number and can be freely defined, if the automatic

CARE allocation mechanisms should not be used.

Note: CARE allows free allocation of Device IDs

between 1 and 4194302 (4.194.302)

• Some customers have created the idea to define

the Object ID (=instance) of a BACnet device.

This is of no use for the system operator or for the

IT department, but sometimes required by the

customer for whatever reason.

As per BACnet standard, the smallest Object ID

(lowest number) for a BACnet device is 33554433.

(The BAcnet formula is: Object ID = Device ID

(=instance) + 33554432.

You can create specific Object IDs for BACnet

devices in CARE, by allocating specific Device IDs:

Example: Customer wants an Object ID of

3700000

You enter the following Device ID in CARE:

Device ID = Object ID - 33554432 =

37000000 - 33554432 = 3445568

Note that the highest possible Object ID that

can be created in CARE is 37748734.

This will allow you to have (37748734-33554432) =

4 Million 194 Thousand and 302 Honeywell BACnet

devices in one system, which will be sufficient for

most installations.

10) Agree on naming conventions for BACnet data-points

• Agree on naming conventions for data-points

names (key names), schedules, and calendars.

• Note that Object IDs for data-points, schedules,

calendars and trends cannot be freely allocated!

This is done automatically be CARE in order to

ensure that these Object IDs are unique on a

(CARE) project wide basis! When using

CreateObject service to create schedules,

calendars and trends Object IDs can be freely

defined.

• Agree on the use of a unique character set for the

project (Excel Web can support ANSI X3.4 or ISO

8859-1)

11) Verify application specific BACnet issues

• Switching priorities for outputs and analogue value

objects

(e.g. Typically priority “8” is used for manual

operator overrides via BACnet front-ends or

operator units, priority “1” is used for manual

overrides at the input/output module)

• Agree on used notification classes, its settings (ack

required, transition event priorities), and the

mechanism how the reciepents will be added.

• Agree on the alarm transition reporting (to

off_normal, to_normal, to_fault) for every data-

point.

• Agree on alarm priorities (priorities of the BACnet

notification classes)

• Agree on the event types (event or alarm) for every

data-point.

12) Verify Honeywell CARE engineering tool related

application issues

• Check to which 3rd party BACnet devices the Excel

Web needs to write and from which it needs to read.

Verify if all LON parameters of XL10/12 devices that

the customer wants to change ONLINE, are

supported by Excel Web / CARE – see

“nvs_supported.xls” spreadsheet on the GE51 docu-

server.

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