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Optically-Isolated AC/DC Changeof-State Digital Input Card
RTP 8437/85
PRODUCT HIGHLIGHTS
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24 optically-isolated AC or DC input points
Voltage source or contact sense inputs
On-card LED indicators
Programmable data polarity
Programmable input filter characteristics
Choice of input voltage
Hot swappable
PRODUCT OVERVIEW
The RTP8437/85, 24-Channel Isolated Change-ofState Digital Input card provides the means to read
the states of 24 single-ended AC or DC digital or
discrete field signals. All input channels are isolated
from the RTP system ground with optical isolators.
Each group of four input channels is isolated from
the other groups. The card also contains change-ofstate circuitry that generates an RTP interrupt
whenever any input channel changes state for
sequence-of-events (SOE) processing.
This card can be ordered with one of six input
voltage levels; all 24 channels are configured for the
same input voltage. Available input voltage levels are:
5V, 12V, 24V, 48V, 125V, and 220V. Input voltage
thresholds for the various ranges are set to approximately 50% of the nominal input voltage. LED
indicators display the logic state of each input.
Each group of four channels can be operated in
either voltage sense mode or contact sense mode
without making any configuration adjustments. The
input circuitry is not sensitive to voltage or current
polarity. In voltage sense mode, the user connects
the return of an external power source to the card,
and each field input must source current to the
card input channel from the output of the external
power source. This is also known as voltage source
mode or wetted contact mode.
In contact sense mode, the user connects an external
power source to the card and each field input must
sink current from the card input to the return of
the power source. This is also known as current
sink mode, grounded contact mode, or dry contact
mode.
Software-programmed input filtering can be applied
to all input signals. Available input filter selections
range from 6.2 microseconds to 838 milliseconds.
This input filter is intended for use with mechanical
RTP 8437/85 Optically Isolated AC/DC COS Digital Input Card
field contacts that are prone to bouncing, or to
remove AC signal components to provide stable
signal detection.
Field termination to the card is provided by plugable
terminal block connectors. Simple screw terminals
allow quick installation and the plugable design
permits fast and easy card changes without the need
to reattach individual leads. No need for additional
cables or termination modules result in an additional
cost benefit.
THE RTP COMMITMENT
Superior Reliability
RTP products have been engineered to provide high
reliability in the field. The RTP 8437/85 OpticallyIsolated AC/DC COS Digital Input Card is designed
to the same standards as other RTP products which
have been qualified under the demanding Class 1E
Nuclear Safety guidelines established by the Nuclear
Regulatory Commission. RTPs exacting product
standards result in minimal system downtime, worry
free maintenance, and a high return on investment.
Engineering Support
RTP provides off-the-shelf delivery as well as
custom-engineered solutions. RTP also backs each
of its products with full technical support and
complete documentation. Call your RTP
representative for additional information,
specifications, and prices.
Non-Obsolescence Policy
In addition to an outstanding 3-Year Warranty, it is
the policy of RTP Corp. to support its products
through the normal life span of the plant or
equipment. Only RTP offers this level of support for
its products.
RTP Corp. 1834 SW 2nd Street Pompano Beach, Florida 33069
PHONE (954) 974-5500 FAX (954) 975-9815 INTERNET: www.rtpcorp.com E-MAIL rtpinfo@rtpcorp.com
SPECIFICATIONS
Terminals
Wire Size:
16 AWG max
Terminal Block Plug
Screws (Torque):
0.25 Nm max
Power Requirements
+5 VDC @ 660 mA
External power source determined by version
Environmental
Operating Temperature Range: 20ºC to +60ºC
Storage Temperature Range: 20ºC to +85ºC
Relative Humidity Range: 20% to 80%, non-condensing
Hig h-Le ve l Inp ut Thre sho ld Vo ltag e
Lo w-Le ve l Inp ut Thre sho ld Vo ltag e
Hig h-Le ve l Inp ut Curre nt (@no m Vin)
Lo w-Le ve l Inp ut Curre nt
Inp ut Vo ltag e Limits
Co ntact Se nse Mo d e
Typ
Max
Mi n
Typ
Max
Max
Max
Max
ON Lo o p Curre nt
Mi n
OFF Lo o p Curre nt
Max
Exte rnal Vo ltag e Sup p ly Curre nt (4-Ch) Max
Exte rnal Vo ltag e Sup p ly Curre nt (To tal) Max
Ext Vo ltag e
Max
5V
3.3
4.0
3.3
1.6
4.1
0.95
12 V
6.6
8.4
6.6
2.9
4.5
0.95
Ve rsio n
24 V
13.2
17.8
13.2
5.8
4.2
0.95
15
5V
16
2.9
0.95
17
102
15
25
12 V
10
3
0.95
19
114
25
40
24 V
7.5
2.9
0.95
17.7
106
40
Electrical Specifications
Input Isolation: 109 Ohms to RTP ground, min
Common Mode
Voltage:
500V max to RTP ground
500V max between channel groups
Switching
Characteristics: 9 µs filter (5 - 48V input)
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16 µs typ, 200 µs max
5 ms filter (5 - 48V input)
4.8 ms typ, 5 ms max
82 ms filter
82 ms, ±1.3 ms
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125 V
70.0
95.0
70.0
16.5
3.7
0.95
220V
123
180
132
32
3.8
0.95
60
48 V
5.5
2.9
0.95
17.7
106
60
160
125 V
5.0
2.7
0.95
15.6
94
130
300
220V
4.8
2.7
0.95
15.8
95
300
Units
V
V
mA
mA
V
Units
mA
mA
mA
mA
V
Model Variations
10 pF / point to RTP ground, typ
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48 V
27.0
36.6
27.0
25.0
4.2
0.95
Mo d e l Numb e r Inp ut Vo ltag e
8437/85-000
8437/85-001
8437/85-002
5V
12V
24V
8437/85-003
8437/85-004
8437/85-005
28V
125V
220V
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Functional Characteristics
Input Points: 24
Input Filter: Programmable, 6.2 µs to 838 ms
Data Polarity: Programmable, ON True or OFF True
RTP 8437/85 Optically Isolated AC/DC COS Digital Input Card Block Diagram
Trademark acknowledgments:
RTP is a registered trademark of RTP Corp. All other product or service names mentioned herein are trademarks of their
respective owners. Specifications subject to change without notice. © 2001-2002 RTP Corp. Printed in USA.
RTP 04/02