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CLASSIC 800 Product Manual
Introduction
IV. 4-20 mA ANALOG OUTPUT
The 4 to 20 mA analog output signal is relative to the Thermal Signal displayed on the Thermal Signal Bar Graph.
The 0% to 100% of Thermal Signal corresponds to 4-20 mA or 20-4 mA.
Refer to View or Adjust the 4-20 mA
Output
for programming this option.
•
The 4-20 mA output signal corresponds to the scaled Thermal Signal view as determined by the range
(LED-0 and LED-100 pointers).
•
The 4-20 mA signal may be displayed either as forward-acting (ascending 4-20 mA) or reverse-acting
(descending 20-4 mA).
•
To view or adjust the 4-20 mA output current configuration: (refer to the
Section 3, “View or Adjust
the 4-20 mA Output Configuration (Forward or Reverse)”
or the
“Classic 800 Series Quick Setup
Guide”
Figure 3 - 4-20 mA Wiring
LOOP -
LOOP +
R2NC
R2NO
R2CM
R1NC
R1NO
R1CM
VAC-H
VAC-N
COM
+VDC
485 (T)
485 (-)
485 (+)
485 (C)
LOOP -
LOOP +
R2NC
R2NO
R2CM
R1NC
R1NO
R1CM
VAC-H
VAC-N
COM
+VDC
485 (T)
485 (-)
485 (+)
485 (C)
LOOP +
4-20 mA Switch Power Supply,
Positive 12/24 VDC
LOOP -
PLC Unipolar Voltage Input,
0 - 5 VDC
250 Ohm
Typical*
COM
Switch Power Supply,
Negative (Common)
+VDC
Switch Power Supply,
Positive 12/24 VDC
DC INPUT (3 or 4 Wire)
LOOP +
4-20 mA Switch Power Supply,
Positive 12/24 VDC
LOOP -
PLC Unipolar Voltage Input,
0 - 5 VDC
Loop Power Supply,
Negative (Common)
GREEN GROUNDING SCREW
Safety Ground
VAC-H
115 VAC, Hot
VAC-N
115 VAC, Neutral
AC INPUT
250 Ohm
Typical*
LOOP -
LOOP +
R2NC
R2NO
R2CM
R1NC
R1NO
R1CM
VAC-H
VAC-N
COM
+VDC
485 (T)
485 (-)
485 (+)
485 (C)
LOOP -
LOOP +
R2NC
R2NO
R2CM
R1NC
R1NO
R1CM
VAC-H
VAC-N
COM
+VDC
485 (T)
485 (-)
485 (+)
485 (C)
LOOP +
4-20 mA Switch Power Supply,
Positive 12/24 VDC
LOOP -
PLC Unipolar Voltage Input,
0 - 5 VDC
250 Ohm
Typical*
COM
Switch Power Supply,
Negative (Common)
+VDC
Switch Power Supply,
Positive 12/24 VDC
DC INPUT (3 or 4 Wire)
LOOP +
4-20 mA Switch Power Supply,
Positive 12/24 VDC
LOOP -
PLC Unipolar Voltage Input,
0 - 5 VDC
Loop Power Supply,
Negative (Common)
GREEN GROUNDING SCREW
Safety Ground
VAC-H
115 VAC, Hot
VAC-N
115 VAC, Neutral
AC INPUT
250 Ohm
Typical*
AC INPUT
DC INPUT (3 or 4 Wire)
MOUNTING BASE PLATE
MOUNTING BASE PLATE
1. 4-20 mA output is passive (opto-isolated)
2. * 4-20 mA output current may be measured as a 1-5V voltage
across a 250 Ohm resistor.
1. 4-20 mA output is passive (opto-isolated)
2. * 4-20 mA output current may be measured as a 1-5V voltage
across a 250 Ohm resistor.
