Introduction

The TELEFAST pre-wired system consists of connecting cables and interface sub-bases as shown below:

1 BMEAHO0412(C) module

2 BMXFCA••0 connecting cables

3 Interface sub-base ABE7CPA21

4 Shield bar

5 Clamp

BMXFCA••0 Connecting Cables

The BMXFCA••0 cables are pre-assembled cord set, made up of:

  • At one end, a compound-filled 20-pin terminal block from which extend 1 cable sheath containing 20 wires,

  • At the other end a 25-pin Sub-D connector.

The figure below shows the BMXFCA••0 cables:

1 BMXFTB2020 Terminal block

2 Cable shielding

3 25-pin Sub-D connector

L Length according to the part number.

The cable comes in 2 different lengths:

  • 1.5 m (4.92 ft): BMXFCA150

  • 3 m (9.84 ft): BMXFCA300

  • 5 m (16.40 ft): BMXFCA300

The following table gives the characteristics of the BMXFCA••0 cables:

Characteristic

Value

Cable

Sheath material

PVC

LSZH status

No

Environmental

Operating temperature

-25...70 °C (-13...158 °F)

Connecting Sensors

Actuators may be connected to the ABE7CPA21 wiring accessory as depicted in the Wiring Diagrams topic.

The distribution of analog channels on TELEFAST terminal blocks with the reference ABE7CPA21 are as follows:

TELEFAST terminal block number

BMEAHO0412 pinout

Signal type

TELEFAST terminal block number

BMEAHO0412 pinout

Signal type

1

NC

Ground

Supp 1

NC

Ground

2

NC

STD(1)

Supp 2

NC

Ground

3

NC

STD(1)

Supp 3

NC

Ground

4

NC

STD(2)

Supp 4

NC

Ground

100

1

CH0

200

2

COM0

101

NC

NC

201

NC

Ground

102

7

CH1

202

8

COM1

103

NC

NC

203

NC

Ground

104

11

CH2

204

12

COM2

105

NC

NC

205

NC

Ground

106

17

CH3

206

18

COM3

107

NC

NC

207

NC

Ground

COMx: Common pin for channel x

NC: Not connected
NOTE: The grounding of cables is facilitated using the ABE7BV•0 wiring accessory.

BMEAHO0412(C) with 2-Wire or 4-Wire Transmitter, TELEFAST Connector

This example illustrates how to connect the output module to either a 2-wire or a 4-wire transmitter using a TELEFAST wiring accessory and cable. The cable includes a 20-pin terminal block. Field power is supplied to the transmitter only for the 4-wire design.

1 2-wire or 4-wire transmitter

2 4-20 mA current loop, with arrows indicating direction of current flow

3 Field power supply (for 4-wire design only)

4 Protective ground

5 Secondary HART (hand-held)

HART Network Cable Characteristics and Lengths

The HART Communication Foundation has developed documentation describing recommended types and diameters of cable for HART networks. This documentation also includes instructions on how to calculate maximum cable lengths for a HART network.

To obtain a copy of this documentation, visit the HART Communication Foundation website at www.hartcomm.org, and download the document FSK Physical Layer Specification (document number HFD_SPEC-054). HART network cable characteristics and lengths information can be found at section 7.5 of this document.