TYPICAL USER PROGRAMS
J
Network No. 1
-
Output a timer, counter, or
sequencer value.
Network #l demonstrates how to output
Network #2 shows how to output several
register values to any field device. Register
constants to a single output register.
4010 accumulates time and outputs its
Switches 1001 through 1006 are contacts of
value to the B374. Similarly, register 4012
a rotary switch to select the appropriate
accumulates counts and outputs its value
constant. “XXX” may be any constant from
to the second B374 channel. “XXX” may be
0 to 999. (Register 4009 should be set to
a constant or another register.
zero.)
Network No. 3
-
Simple Discrete-to-Analog
Loop Control.
lOOI
1002
Network #3 demonstrates how to program
discrete-to-analog loop control. It may be
used for simple level, pressure, tempera-
ture, or position control. Switch 1001
controls the upper limit by forcing a zero
value into output register 4010, thereby
using the B374 to turn off an analog field
device. Switch 1002 forces value “XXX” to
output register 4010 and the field device.
Similarly, switch 1003 forces value “YYY”.
Generally, “YYY” is greater than “XXX”. For
&
greater resolution, expand the program with
additional inputs to register 4009.
Network No. 2
-
Output several constants to
to an output using a rotary
switch.
How to determine...
1.
2.
The loop power supply (V~oop) knowing
the load resistance (RL).
The load resistance (RL) knowing the
loop power supply
WL00p).
“LOOP
(volts)
70
I
0
“LOOP =
ohms
I 1
I ’ ’ ’ I ’ ’ ’ I
0
1000
2000
3000
NOTES:
RL (ohms)
1.
2.
3.
For a loop power supply (V~oop) of 45V,
the load resistance (RL) can range be-
tween 750 and 1900 ohms.
For a load resistance (RL) of 1250 ohms,
the loop power supply (V~oop) can range
between 32 and 55 volts.
V~oo~ can never exceed 60 volts.
45V
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