Omega Vehicle Security OM5-C Manual De Usuario
24
OM5-TX
2-Wire Transmitter Interface Modules
ter. This allows a 2-wire loop powered transmitter to be directly connected
to the module without requiring an external power supply. The regulated
supply will provide a nominal +20VDC at a loop current of 4mA to 20mA.
to the module without requiring an external power supply. The regulated
supply will provide a nominal +20VDC at a loop current of 4mA to 20mA.
The OM5-TX will provide a 1500V isolation barrier for non-isolated 2-wire
field transmitters. It can also be used when additional isolation is required
between an isolated 2-wire transmitter and the input stage of the control
room computer.
field transmitters. It can also be used when additional isolation is required
between an isolated 2-wire transmitter and the input stage of the control
room computer.
The voltage output is logic switch controlled, which allows these modules
to share a common analog bus without the requirement of external
multiplexers.
to share a common analog bus without the requirement of external
multiplexers.
The modules are designed with a completely isolated computer side circuit
which can be floated to
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.
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 precision 20
Ω current conversion resistor is supplied with the module.
Sockets are provided on the OM5-BP backpanels to allow installation of
this resistor. Extra resistors are available under part number OMX-1362-C.
All field inputs are fully protected from accidental connection of power-line
voltages up to 240VAC. The module has a 3dB bandwidth of 100Hz. Signal
filtering is accomplished with a six-pole filter, with two poles on the field
side of the isolation barrier, and the other four on the computer side.
this resistor. Extra resistors are available under part number OMX-1362-C.
All field inputs are fully protected from accidental connection of power-line
voltages up to 240VAC. The module has a 3dB bandwidth of 100Hz. Signal
filtering is accomplished with a six-pole filter, with two poles on the field
side of the isolation barrier, and the other four on the computer side.
FIGURE 1. OM5-TX Block Diagram.
FEATURES
● ISOLATED +20VDC CURRENT LOOP SUPPLY
● PROVIDES ISOLATION FOR NON-ISOLATED 2-WIRE
● PROVIDES ISOLATION FOR NON-ISOLATED 2-WIRE
TRANSMITTERS
● HIGH LEVEL VOLTAGE OUTPUT: +1V to +5V or +2V to +10V
● 1500Vrms TRANSFORMER ISOLATION
● ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
● INPUT PROTECTED TO 240VAC CONTINUOUS
● 100dB CMR
● 100Hz SIGNAL BANDWIDTH
● ±0.05% ACCURACY
● ±0.02% LINEARITY
● CSA CERTIFIED, FM APPROVED, CE COMPLIANT
● MIX AND MATCH OM5 TYPES ON BACKPANEL
● 1500Vrms TRANSFORMER ISOLATION
● ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
● INPUT PROTECTED TO 240VAC CONTINUOUS
● 100dB CMR
● 100Hz SIGNAL BANDWIDTH
● ±0.05% ACCURACY
● ±0.02% LINEARITY
● CSA CERTIFIED, FM APPROVED, CE COMPLIANT
● MIX AND MATCH OM5 TYPES ON BACKPANEL
DESCRIPTION
Each OM5-TX 2-wire transmitter interface module provides a single chan-
nel which accepts a 4 to 20 mA process current input and provides a
standard +1 to +5V or +2 to +10V output signal (Figure 1). An isolated
+20VDC regulated power supply is provided to power the current transmit-
nel which accepts a 4 to 20 mA process current input and provides a
standard +1 to +5V or +2 to +10V output signal (Figure 1). An isolated
+20VDC regulated power supply is provided to power the current transmit-
LPF
+In
–In
–EXC
Backpanel
Term Block
1
2
NC
4
6
5
3
Surge
Suppression
and
Protection
Isolated
Field-Side
Power
Isochopper™
Amplifier
Pat Pending
4
3
2
1
+EXC
–V
+V
–V
+V
Isolated
Computer-Side
Power
NC
LPF
V
OUT
20
19
22
I/O Common
RD EN\
Power
Oscillator
+5V
17
16
Power
Common
Common
2-Wire
Transmitter
20
Ω
0.1% plug-in
OMX-1362-C
Isolated
Excitation
Source