XNX Universal Transmitter
Section 2 - Installation and Operation
37
2.2.4 4-20mA Output, Common Connections, and
Power Settings
The XNX Universal Transmitter allows the user to configure
the 4-20mA output to Sink, Source, or Isolated mode
operation via two programming switches on the POD
1
� The
Switch Configuration table shows the S1 and S2 setting and
corresponding output configuration�
Switch Configuration
Mode
S1
S2
Source
Down
Up
Sink
Up
Down
Isolated
Down
Down
Most controllers in the market will accept source-configured
devices� Sink-configured signals are used in older technology
controllers, which reduce the need for complete system
upgrades�In isolated-signal devices, if the controller fails or the
mA signal wires are disconnected or broken, the field device will
remain operational� Most controllers in the market will accept
isolated configured devices�
Power and 4-20mA connections are made at TB-1 and are
identical for the EC, IR, and mV Personality Boards� For user
convenience, a second set of +Ve and -Ve power terminals have
been provided to eliminate the need for a secondary junction
box in multi-node systems when used with the supplied terminal
jumpers�
The total load resistance for the 4-20mA output should be
kept lower than 500
Ω
, including the resistance of the properly
selected 4-20mA cable and input impedance of the equipment
to be connnected� The minimum loop impedence is 200 ohms;
1 The 4-20 mA output state is refreshed at least every two seconds (once per second is typical).
the maximum is 500 ohms� If the 20 mA output is not used, a 500
ohm resistor must be installed�
The XNX Universal Transmitter power consumption is dependent
on the sensor and options for the specific configuration� For
proper operation, the input voltage must be maintained at 16 to
32 VDC for EC and mV units and 18 to 32 VDC for IR units�
Controller
+VE
Signal
-VE
R
L
1
2
3
1-1
1-5
1-3
+V
+mA
-V
XNX
XNX Sink Configuration
Current
Flow
Figure 36. Sink wiring for XNX
XNX Source Configuration
Controller
+VE
Signal
-VE
R
L
1
2
3
1-1
1-6
1-3
+V
-mA
-V
XNX
Current
Flow
Terminate cable screen at the detector or controller, not both.
Figure 37. Source wiring for XNX
Controller
+V1
+V2
-V2
1-1
1-5
1-6
+V
+mA
-V
XNX
1-3
-mA
-V1
XNX Isolated Configuration
Figure 38. Isolated wiring for XNX
Summary of Contents for XNX
Page 1: ...Technical Manual XNXTM Universal Transmitter ...
Page 2: ......
Page 6: ...XNX Universal Transmitter Table of Contents 4 Table of Contents ...
Page 11: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 9 1 Introduction ...
Page 91: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 89 3 Calibration ...
Page 104: ...XNX Universal Transmitter Section 3 Calibration 102 ...
Page 105: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 103 4 Maintenance ...
Page 128: ...XNX Universal Transmitter Section 5 Warnings Faults 126 ...
Page 129: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 127 6 Specifications ...
Page 152: ...XNX Universal Transmitter Section 6 Specifications 150 Figure 232 XNX BT Configuration ...
Page 161: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 159 7 Control Drawings ...
Page 162: ...XNX Universal Transmitter Section 7 Control Drawings 160 7 1 XNX UL INMETRO ...
Page 163: ...XNX Universal Transmitter Section 7 Control Drawings 161 ...
Page 164: ...XNX Universal Transmitter Section 7 Control Drawings 162 ...
Page 165: ...XNX Universal Transmitter Section 7 Control Drawings 163 7 2 XNX UL CSA FM ...
Page 166: ...XNX Universal Transmitter Section 7 Control Drawings 164 ...
Page 167: ...XNX Universal Transmitter Section 7 Control Drawings 165 ...
Page 192: ...XNX Universal Transmitter Appendix B Modbus Protocol 190 ...
Page 193: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 191 Appendix C Warranty ...
Page 195: ...XNX Universal Transmitter XNX Universal Transmitter Technical Manual 193 Index ...
Page 199: ......