OM5-IFI

Frequency Input Modules

FEATURES

ACCEPTS FREQUENCY INPUTS OF 0 to 100kHz

PROVIDES HIGH LEVEL VOLTAGE OUTPUTS

TTL LEVEL INPUTS

1500 VOLT TRANSFORMER ISOLATION

ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION

INPUT PROTECTED TO 240VAC CONTINUOUS

±0.05% ACCURACY

MIX AND MATCH OM5 TYPES ON BACKPANEL

CSA CERTIFIED, FM APPROVED, CE COMPLIANT

DESCRIPTION

Each OM5-IFI Frequency input module provides a single channel of fre- quency input which is isolated and converted to a high level analog voltage output. This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers (Figure 1).

The frequency input signal can be a TTL level signal or a zero-crossing signal. Terminal 3 (+In) on the field-side terminal block is the “common” or ground connection for input signals. A TTL signal is connected from terminal 2 (–In) to terminal 3 (+In), while a zero-crossing signal is connected from terminal 4 (+EXC) to terminal 3 (+In). Input circuitry for each of the signal types has hysteresis built in. An input signal must cross entirely through the hysteresis region in order to trigger the threshold comparator.

A 5.1V excitation is available for use with magnetic pick-up or contact- closure type sensors. The excitation is available on pin 1 (–EXC) and the excitation common is pin 3 (+In).

The modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin to I/O Common, pin 19.

A special circuit in the input stage of the module provides protection against accidental connection of power-line voltages up to 240VAC.

Zero-Crossing

 

 

 

 

Threshold

 

F to V

 

 

 

 

4

 

Comparator

 

 

 

Inputs

+EXC

 

 

 

 

 

 

 

+

 

4

 

 

Signal

 

LPF

20

VOUT

 

 

 

 

 

 

 

 

Surge

Isolation

 

 

+In

 

6

 

 

TTL

3

 

Suppression

 

 

 

 

 

 

 

and

 

 

 

 

 

 

Inputs

 

 

 

 

19

 

 

 

5

 

 

 

 

+

 

Protection

 

+V

–V

I/O Common

 

 

 

 

–In

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

–EXC

 

 

 

 

 

22

 

 

 

 

 

 

Isolated

RD EN\

 

1

 

 

 

 

 

 

 

 

 

Computer-Side

 

 

 

 

 

 

5.1V

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

Backpanel

 

 

 

 

 

 

 

 

Term Block

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

NC

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

NC

 

 

 

17

 

 

 

 

 

+V

 

 

 

+5V

 

 

 

 

Isolated

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

–V

Field-Side

 

 

 

 

 

 

 

 

Oscillator

 

 

 

 

 

 

 

Power

 

16

 

 

 

 

 

 

 

 

Power Common

 

 

 

 

 

 

 

 

 

FIGURE 1. OM5-IFI Block Diagram.

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Omega Vehicle Security OM5-C manual OM5-IFI, Frequency Input Modules

OM5-C specifications

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Overall, the Omega Vehicle Security OM5-C stands out as a premier choice for vehicle protection, combining innovative technology with user-centric features. This state-of-the-art security system not only defends against theft but also enhances the overall security experience for vehicle owners, making it an invaluable investment for safeguarding automobiles.