Automated Logic InterOP8500 Instructions techniques - Page 13

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then binary inputs can be internally powered

(no isolation) or externally powered

(isolated). Note the orientation of the

jumpers.

Grip

Here

Internal Power

(no isolation)

Figure 15. Binary I/O Power Jumper

Binary Inputs

The InterOP8500 provides 8 binary inputs

with direct connection to the Johnson field

termination board. The inputs are for signals

in the range of -38VDC up to +38VDC. A

digital input microblock indicates On for any

voltage between -38.0VDC and 0.9VDC; it

indicates Off for any voltage between 2.5VDC

and 38.0VDC. These inputs are capable of

counting up to 1,000 pulses per second for

use in pulse-counting configurations. Each

binary input can sense either a set of non-

energized contacts, or a two-state DC voltage

level.

The field termination board contains three

terminals for each binary input point (see

Figure 12 on page 10):

Termination Row 1 This terminal is

connected to an input buffer (each input

has a separate buffer).

Termination Row 2 This terminal is the

input signal common.

Termination Row 3 Do not use terminal 3

unless you need to connect an earth

ground.

The common terminals for the binary inputs

are joined to the common terminals for the

binary outputs. All common terminals are

joined to the isolated 12VDC supply's

negative terminal through the field

termination board. This binary ground is

isolated and independent of the logic and

Revised 7/10/01 • InterOP8500

analog supply ground coming from the RPA-

105.

NOTE All eight binary input terminals are

NOTE

electrically connected on the field termination

board. To prevent ground loops, electrically

isolate the sources of the binary input signals

from each other.

Binary Outputs

External Power

(isolated)

The InterOP8500 provides 16 binary outputs

with a direct connection to the field

termination board. The 16 binary outputs

have suppression. The binary output power

requirement is 13.2VDC, which should be

supplied by an external Class 2 power supply.

The output of this external power supply is

connected to a pair of field terminals located

on the field termination board (see Figure 12

on page 10 for location). The maximum load

through each binary output is 200mA.

The field termination board has terminal

capacity for between 8 and 16 points

depending upon the types of output signals

provided. Each of the eight BO points located

on the termination board consists of six field

terminals. Each of these six field terminals

can provide either one or two independently

controlled binary output points. The function

of these terminals is as follows:

Termination Rows 1-2 These terminals

are independently connected to either

+12VDC or isolated common (depending on

application).

Termination Rows 3-4 These terminals

are connected to isolated common. They are

used with terminals 1 and 2 for fixed-polarity

signals.

Termination Rows 5-6 These terminals

are unused.

NOTE

NOTE Terminals 1, 2, 3, and 4 must not be

grounded. Voltages from field devices must