Emerson 3 MS/TP Network Connection To E2, BACnet IP Internet Protocol, Discovery

6.4.2.2BACnet IP (Internet Protocol)

The E2 also supports connecting to devices through IP (Internet Protocol). The device ID is used to identify the devices.

6.4.2.3Discovery

BACnet supports discovery of the devices on a net- work and interrogation of the devices so they report what data objects they contain and what properties each object supports.

6.4.2.4Client-Server

To describe which role the device plays during com- munication we will use the term: client-server. The client is the side that actively initiates the request. The server is the side that passively responds to the client reply. BACnet devices can act both as client and server.

Most simple MS/TP and IP devices are passive serv- ers. They wait passively for a system to poll them for data and only then do the devices respond. The E2 will mostly be an active client (although it does have to support some server aspects).

6.4.3MS/TP Network Connection

to E2

Before setting up a BACnet, the port on the E2 that has the MODBUS cable connected must be set up as a MOD- BUS port.

1.Log in to the E2 with Level 4 access.

2.Press followed by - General Controller Info.

3.Press +to open the Serial tab of the Gen- eral Controller Info setup screens.

4.This screen will have a “Connection” field for all COM ports on the E2. Highlight the COM port and choose which route it represents such as “BACnet MSTP-1”.

5.Input the MAC address in the MSTP MAC field that the E2 will use for the COM port connection.

6.Under the BACnet tab, several parameters can be changed on the device object.

Figure 6-12 - BACnet Tab

•Object ID - This is the ID used by the E2 when participating on a BACnet network. The E2 sup- ports only the Device Object.

•Max Master - This is the highest number of MS/TP MAC addresses that will be searched for on an MS/TP network. This number must be higher than the controller with the highest MS/TP MAC address. Lowering this number will improve throughput of data from the E2.

•ADPU timeout - This is the length of time that the E2 will wait for a response from a controller.

•ADPU retries - This is the number of times the E2 will attempt to communicate to a controller before attempting another message.

6.4.3.1Add and Connect a BACnet

Device

To enable communications between E2 and the BAC- net, the devices must be added and addressed in E2.

1.Log in to the E2 with Level 4 access.

2.Press - Connected I/O Boards and Controllers.

3.On the Third Party tab, enter the number of BACnet devices in the BACnet number field.

To commission the device:

4.Press to return to the Network Setup menu, then select - Network Summary.

6-14 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013