Engineering Documentation

Chapter 3 – Field Panels
TX-I/O Product Range
125
-3002 97 | 231
Example 1
Calculating the maximum TX-I/O island bus power that a Power Supply can deliver to
a Bus Connection Module over the maximum wire length (164 ft).
● One 14 AWG shielded triad (CS, CD, )
+ One 14 AWG twisted shielded pair (24V~, )
● R(14 AWG) = 2 × 164 ft × 0.006 Ω/ft = 1.968 Ω ~ 2 Ω
● Maximum DC Power = 12 V
2
/ 2 Ω = 6 W
● Maximum AC Power = 48 V
2
/ 2 Ω = 24 VA
- or -
● One 16 AWG twisted shielded 4 Conductor (CS, CD, , 24V~)
● R(16 AWG) = 2 × 164 ft × 0.009 Ω/ft = 2.952 Ω ~ 3 Ω
● Maximum DC Power = 12 V
2
/ 3 Ω = 4 W
● Maximum AC Power = 48 V
2
/ 3 Ω = 16 VA
Example 2
Calculating the maximum distance between a fully-loaded Bus Connection Module
and a Power Supply.
● One 14 AWG twisted shielded 4 Conductor (CS, CD, , 24V~)
● R(14 AWG) = 2 × 164 ft × 0.006 Ω/ft = 1.968 Ω ~ 2 Ω
● DC Length = 12 V
2
/ (2 × 0.006 Ω/ft × 28.8 W) = 35 ft
● AC Length = 48 V
2
/ (2 × 0.006 Ω/ft × 96 VA) = 42 ft
● DC Length must be no greater than 35 ft
● If 4 branches are used, the total length of 140 ft is within the 164 ft maximum.
● Transformer at the power supplies must be at least 4 × 150 VA + 24 VA (PXC) =
624 VA
● Each branch must have a 24V~ interrupt to be run as Class 2
TX-IO Module Wiring Diagrams
Module Type Specifics [Page Number]
Digital Input Modules (TXM1.8D and TXM1.16D) Digital Input Module Terminal Layout [
➙
98]
Dry Contacts; Supervised
Digital Output Modules (TXM1.6R and TXM1.6R-M) Digital Output Module Terminal Layout [
➙
99]
Latched; Not Supervised
Pulsed; Not Supervised
Universal and Super Universal Input/Output Modules
(TXM1.8U, TXM1.8U-ML, TXM1.8X, and TXM1.8X-ML)
Universal Module Terminal Layout [
➙
101]
Super Universal Module Terminal Layout [
➙
101]
Digital Input (Dry Contacts; Not Supervised) [
➙
102]
Digital Input (Using AI, Supervised)
See
MEC Wiring Diagram to Use an AI as a DI [
➙
162]
Temperature Sensor Input (RTD and Thermistor; Supervised)
[
➙
103]
0-10 Vdc Input (Voltage; Supervised) [
➙
103]
2-wire and 3-wire Active Input (Current; Supervised)—Super
Universal Modules Only [
➙
104]
Analog Output (Voltage or Current; Not Supervised) [
➙
104]