Connecting Inputs - Omega CN8EPt User Manual

TM
PLATINUM Series Controllers User's Guide

3.3 Connecting Inputs

The 10-pin universal input connector assignments are summarized in Table 1. Table 2 provides detail for
the specific types of sensors supported. All sensor selections are firmware-controlled (see
Configuration (INIt > INPt)) and no jumper settings are required when switching from one type of sensor
to another. Figure 5 provides more detail for connecting RTD sensors. Figure 6 shows the connection
scheme for process current input with either internal or external excitation. Figure 7 shows the
connections for Single Ended and Differential input voltages.
Pin No. Code Description
1 ARTN Analog return signal (analog ground) for sensors and remote Setpoint
2 AIN+ Analog positive input
3 AIN- Analog negative input
4 APWR Analog power currently only used for 4-wire RTDs
5 AUX Auxiliary analog input for remote Setpoint
6 EXCT Excitation voltage output referenced to ISO GND
7 DIN Digital input signal (latch reset, etc.), Positive at > 2.5V, ref. to ISO GND
8 ISO GND Isolated ground for serial communications, excitation, and digital input
9 RX/A Serial communications receive
10 TX/B Serial communications transmit
Pin Diff Process
Number Voltage Voltage
1 Rtn
Vin +/-
2 Vin +/-
Vd +/-
3
4
5
*For Remote Setpoint with an RTD, Pin 1 on the Output Connector must be used for the RtN instead of Pin 1 on the
Input Connector. Remote Setpoint is not available if using an RTD sensor and have an SPDT (Type 3) Output
installed.
** Requires external connection to pin 4
M5451
Table 1 – 10-Pin Input Connector Wiring Summary
Table 2 – Interfacing Sensors to the Input Connector
Process Thermo-
Current couple
I+ T/C+
I- T/C-
2-Wire 3-Wire 4-Wire
RTD RTD RTD
** RTD2- RTD2+
RTD1+ RTD1+ RTD1+
RTD2-
RTD1- RTD1- RTD1-
Omega Engineering | www.omega.com
Wiring Instructions 12
4.1 Input
Remote
Thermistor
Setpoint
Rtn(*)
TH+
TH-
V/I In