Publication 1794-6.5.11 - November 1997
B-2
Schematics
Output Circuits
The 1794-IJ2 module output logic consists of digital outputs.
Digital Outputs
The module’s output is comprised of an isolated power MOSFET. This
device operates in current sourcing mode, and is capable of delivering up
to 1A (@ 10-31.2V dc).
IEC 1+ or
24V dc
Switch Input
50/500mV
Input
6V Vortex
Input
3V Vortex
Input
50mV Select
Jumper
Internal 500mV
Ref. Voltage
Return
Lead Breakage
Reference Voltage
Isolated 24V Power
Invert Frequency
(Gate) Input
Ex
Nor
Frequency Lead Break
(Gate Lead Break)
Frequency Input
(Gate Input)
(F and G,
15mA each)
Frequency only, not on gate
2.15K
W
2.15K
W
2.5K
W
100pF
24V
215
W
47pF
100pF
100pF
825
W
8.25K
W
100K
W
46.4K
W
8.25K
W
5.11K
W
10K
W
100pF
10K
W
100pF
+
-
+
-
Customer supplied power, ranging from +10V to +31.2V dc, is connected internally to
the power output transistor. When an output is turned on, current flows into the source,
out of the drain, through the load connected to the ground of the customer supply
(customer return). Diode D6 protects the power output transistors from damage due to
inductive loads.
Output Q1 is a thermally protected FET and will turn off @ 3A (approximately). After an
output goes into thermal shutdown, you must fix the cause of the shutdown and toggle
the outputs ON and OFF to reenergize the output.
D5
Q1
Output 0
Output
TEMPFET
s
dc
Supply
Supply Return
10-31.2V
Alarm
R
load
1A max
D6
RT1
Output Channel
RT1 protects D6 and Q1 if power supply polarity is reversed.
10K
W
3.83K
W
3.83K
W
6.8V