Revised 7/10/01 • InterOP8500
13
© 2001 Automated Logic Corporation
then binary inputs can be internally powered
(no isolation) or externally powered
(isolated). Note the orientation of the
jumpers.
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
analog supply ground coming from the RPA-
105.
NOTE
NOTE
NOTE
NOTE All eight binary input terminals are
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
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
NOTE
NOTE Terminals 1, 2, 3, and 4 must not be
grounded. Voltages from field devices must
Figure 15. Binary I/O Power Jumper
External Power
(isolated)
Grip
Here
Internal Power
(no isolation)
