Sens NRG24-20 Spezifikationen PDF herunterladen (Seite 64)

NETWORK APPLICATIONS

POWERCOMMAND NETWORKS

ETWORK CABLING AND CONNECTIONS FOR FTT-10 NETWORKS

Network Topology

FTT-10 networks are designed to support free topology wiring, and will accommodate bus, star, ring,

or any combination of these topologies. Excepting the double-terminated bus topology, only one point

of termination is required for any free topology segment. Note that the actual termination circuit will

vary by application (See “Cable Termination” below.)

Network Nodes

Each device with an FTT-10 transceiver is a network node. The maximum number of nodes on a

network segment and on the total network is partly dependant on the network application. For

example, a network that is connecting only a few discrete variables between devices and has no

monitoring software attached could probably support 64 nodes (maximum allowable on a segment per

Echelon specs.) At the other extreme, a network with a large amount of inter-device bindings and

being monitored by PowerCommand PULSE with Reporting option would not be able to support

more than 12 devices using a single FTT-10 channel. However, with the appropriate addition of other

network management devices, the PULSE example could potentially support 64 devices or even

more. If there is any question about how many devices your network can support, contact the

Network Applications Engineer in the CPG System Sales department.

Network Cable Selection

The following cables are qualified for use with FTT-10 networks:

• NEMA Level IV cable (Onan P/N 334-1350 [PVC] or 334-1351 [Plenum])

• Belden 85102 or Belden 8471 (both are

single twisted pair)

• TIA Category 5 (CAT5)

Network wiring should be run in separate conduit and installed following local electrical codes. Any

wire connected to Generator Sets must be stranded wire (NFPA110, Para. 7.12.4.1). Except when

using ring topology, cabling is not polarity sensitive. The average temperature of the wire should not

exceed +55ºC (+131ºF). Cable distance must comply with transmission specifications listed below.

The maximum total wire length is the total length of wire within a segment. The maximum node-to-

node distance is the maximum allowable distance between each individual node or the terminator.

Table 1 Free Topology

Maximum node-to-node

distance

Maximum total

Wire length

Belden 8471 1300 1600

Belden 85102 1600 1600

NEMA Level IV 1300 1600

TIA Category 5 800 1400

This information was accurate on the date published but Page 1 July 25, 2003

could change without notice.

* Optimal Cable

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