Yokogawa EJA440E Manuel d'utilisateur télécharger pdf (Page 7)

<2. Connection>

2-1

IM 01C25T03-01E

2. Connection

The BRAIN communication signal is superimposed

onto the 4 to 20 mA DC analog signal. Since

the modulated wave is a communication signal,

superimposing it on the normal signal will,

from basic principles, cause no error in the DC

component of the analog signal. Thus, monitoring

can be performed via the BT200 while the

transmitter is on-line.

2.1 Connecting the BT200

Connection to the transmitter with the BT200

can be made by either connecting to the BT200

connection hooks in the transmitter terminal box or

by connecting to a relaying terminal or a terminal

board.

Relaying

terminals

Distributor

Control room

Terminal board

F0201.ai

SUPPLY

PULSE

CHECK

ALARM

Figure 2.1 Connecting the BT200

2.2 Communication Line

Requirements

DPharp

BT200

Cable

resistance Rc

Cable resistance Rc

Load

resistance R

Power

supply

● Loop resistance = R + 2Rc

= 250 to 600 Ω

● Loop capacitance = 0.22 µF max.

F0202.ai

Figure 2.2 Communication Line Requirements

2.3 Power Supply Voltage and

Load Resistance

When conguring the loop, make sure that the

external load resistance is within the range in the

gure below.

(Note) With an intrinsically safe transmitter, external load

resistance includes safety barrier resistance.

600

250

0 10.5 16.6 25.2 42

External

load

resistance

R (Ω)

Power supply voltage E (V DC)

F0203.ai

Communication

applicable range

E–10.5

0.0244

Figure 2.3 Relationship between Power Supply

Voltage and External Load Resistance

1 2 3 4 5 6 7 8 9 10 11 12 ... 40 41

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Yokogawa EJA440E Manuel d'utilisateur Page 7

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