Emerson ROC364 Manual de Instruções descarregar pdf (Página 10)

ROC364 Instruction Manual

6-6 Rev 5/00

6.4.2 Analog Output Channels

Analog outputs (AOs) provide a current output for powering analog devices. The ROC364 I/O Card

analog output is a 4-20 mA loop signal.

Two analog outputs are provided on the I/O Card. They are designated Point Numbers B9 and B10.

The second and third terminal positions are connected as follows:

+ Positive load

- Negative load

A schematic representation of the field wiring connections to the analog output channel is shown in

Figure Section: 6-5. The AO provides loop current (4- to 20 mA) from the “+” terminal to non-

powered field devices. If an I/O Conveter Card is installed in the ROC364 MCU, the “+” terminal

provides power for loop-powered devices at 24 volts; otherwise, the source power at the “+” terminal is

the same as the 12 or 24 Vdc power supplied to the MCU. Note that terminal “-” is connected to an

isolated analog signal common.

COM

B9 and B10

CONTROL

Figure Section: 6-5. Analog Output Wiring for Current Loop Devices

6.4.3 Discrete Input Channels

Discrete inputs (DIs) monitor the status of relays, solid-state switches, an intrusion switch, or other two-

state devices. DI functions support discrete latched inputs and discrete status inputs.

The I/O Card discrete inputs acquire power from the ROC power supply. An LED indicator is included

for each channel. The signal from the field is coupled through an optical isolator providing isolation

from the main circuit board.

ROC-POWERED

LOOP DEVICE

DOC0311A-R32

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Emerson ROC364 Manual de Instruções Página 10