Emerson ROC364 Manuál s instrukcemi stáhnout pdf (Strana 11)

ROC364 Instruction Manual

Rev 5/00 6-7

The discrete inputs provided on the I/O Card are configured as Point Number A1 to Point Number A12.

They are connected using the second and third terminal positions as follows:

+ Positive Discrete Input

- Common

The discrete input operates by providing a voltage across terminals “+” and “-” (see Figure Section: 6-

6), which is derived from internal voltage source Vs. When a field device, such as a relay contact, is

connected across “+” and “-”, the closing of the contacts completes the circuit, which causes a flow of

current between Vs and ground at terminal “-”. This current flow activates the LED and is sensed in

the DI circuitry which, in turn, signals the MCU electronics that the relay contacts have closed. When

the contacts open, current flow is interrupted and the DI circuit signals this to the electronics.

CAUTION

The discrete input is designed to operate only with non-powered discrete devices

such as “dry” relay contacts or isolated solid state switches. Use of the DI channel

with powered devices may cause improper operation or damage to occur.

ROC-POWERED

DISCRETE DEVICE

6.65K

A1 to A12

DOC0309A-R32

Figure Section: 6-6. Discrete Input Wiring

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

Žádné komentáře

Emerson ROC364 Manuál s instrukcemi Strana 11