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Install Guide
Publication0100152‐01Rev.A(1794sc‐IF8IU)December2008
Wire Connections for the Isolated Universal
Input Module
Terminal Base Unit Wiring Connections
Channel
Number
1794-TB3G and 1794-TB3GS Terminal Base Units
Signal
Return
(R)
Input +
(IN+)
Input
(-)
I Return
(-)
0 A-0 A-1 A-2 A-3
1 A-4 A-5 A-6 A-7
2 A-8 A-9 A-10 A-11
3 A-12 A-13 A-14 A-15
4 B-17 B-18 B-19 B-20
5 B-21 B-22 B-23 B-24
6 B-25 B-26 B-27 B-28
7 B-29 B-30 B-31 B-32
1Terminals 16, 33, and 40…45 are chassis ground.
Example of RTD/Resistance Wiring to a 1794-TB3G
Terminal Base Uni
t
Example of Thermocouple Wiring to a 1794-TB3G Terminal
Base Unit
Example of Voltage Wiring to a 1794-TB3G Terminal Base
Unit
Example of Current Wiring to a 1794-TB3G Terminal
Base
Input Map and Configuration (EDT)
The following information is presented for experienced users only. Refer
to the user manual, publication 0300239-01, for complete information on
programming and configuring your module.
Input Map (Read)
Usage (16 bit words):
I:0 Channel 0 input Data.
I:1 Channel 1 input Data.
I:2 Channel 2 input Data.
I:3 Channel 3 input Data.
I:4 Channel 4 input Data.
I:5 Channel 5 input Data.
I:6 Channel 6 input Data.
I:7 Channel 7 input Data.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
S:0 OverRange (CH0/Bit 8, CH1/Bit 9, …) UnderRange (CH0/Bit 0, CH1/Bit 1, …)
S:1 User HI Alarms (CH0/Bit8, CH1/Bit9, …) User LO Alarms(CH0/Bit0, CH1/Bit1, …)
S:2 Reserved CJC
Alarm
Broken Input Alarms
S:3 Reserved Diagnostics
CJC Alarm
Bit 9 Bit 8 CJC Alarm:
0 0 No Errors
0 1 CJC1 is broken.
1 0 CJC2 is broken.
1 1 Both CJC1 and CJC2 are broken.
EDT Configuration Table
Usage (16 bit words):
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
C:0 R
1
R
1
F7 F6 F5 F4 R
1
R
1
R
1
F3 F2 F1 F0 R
1
C:1 °F
Ch0
DC
Ch0
BIM
Ch0
R
1
Data Format
Ch0
Input Filter
Ch0
Input Type CH0
C:2 °F
Ch1
DC
Ch1
BIM
Ch1
R
1
Data Format
Ch1
Input Filter
Ch1
Input Type CH1
C:3 °F
Ch2
DC
Ch2
BIM
Ch2
R
1
Data Format
Ch2
Input Filter
Ch2
Input Type CH2
C:4 °F
Ch3
DC
Ch3
BIM
Ch3
R
1
Data Format
Ch3
Input Filter
Ch3
Input Type CH3
C:5 °F
Ch4
DC
Ch4
BIM
Ch4
R
1
Data Format
Ch4
Input Filter
Ch4
Input Type CH4
C:6 °F
Ch5
DC
Ch5
BIM
Ch5
R
1
Data Format
Ch5
Input Filter
Ch5
Input Type CH5
C:7 °F
Ch6
DC
Ch6
BIM
Ch6
R
1
Data Format
Ch6
Input Filter
Ch6
Input Type CH6
C:8 °F
Ch7
DC
Ch7
BIM
Ch7
R
1
Data Format
Ch7
Input Filter
Ch7
Input Type CH7
C:9 CH0 User Low Alarm Threshold
C:10 CH0 User High Alarm Threshold
C:11 CH0 User Alarm Deadband
C:12 CH1 User Low Alarm Threshold
C:13 CH1 User High Alarm Threshold
C:14 CH1 User Alarm Deadband
C:15 CH2 User Low Alarm Threshold
C:16 CH2 User High Alarm Threshold
C:17 CH2 User Alarm Deadband
C:18 CH3 User Low Alarm Threshold
C:19 CH3 User High Alarm Threshold
C:20 CH3 User Alarm Deadband
C:21 CH4 User Low Alarm Threshold
Usage (16 bit words):
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
C:22 CH4 User High Alarm Threshold
C:23 CH4 User Alarm Deadband
C:24 CH5 User Low Alarm Threshold
C:25 CH5 User High Alarm Threshold
C:26 CH5 User Alarm Deadband
C:27 CH6 User Low Alarm Threshold
C:28 CH6 User High Alarm Threshold
C:29 CH6 User Alarm Deadband
C:30 CH7 User Low Alarm Threshold
C:31 CH7 User High Alarm Threshold
C:32 CH7 User Alarm Deadband
C:33 CH0_Cal_Offset
C:34 CH1_Cal_Offset
C:35 CH2_Cal_Offset
C:36 CH3_Cal_Offset
C:37 CH4_Cal_Offset
C:38 CH5_Cal_Offset
C:39 CH6_Cal_Offset
C:40 CH7_Cal_Offset
C:41 CH0_CJC_Offset
C:42 CH1_CJC_Offset
C:43 CH2_CJC_Offset
C:44 CH3_CJC_Offset
C:45 CH4_CJC_Offset
C:46 CH5_CJC_Offset
C:47 CH6_CJC_Offset
C:48 CH7_CJC_Offset
1
Reserved for future expansion
F0 through F7 (Channel n Fault Mode)
State Function
0 Disabled
1 Broken input testing enabled
Input Type
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Range:
0 0 0 0 0 B Type Thermocouple
0 0 0 0 1 C Type Thermocouple
0 0 0 1 0 E Type Thermocouple
0 0 0 1 1 J Type Thermocouple
0 0 1 0 0 K Type Thermocouple
0 0 1 0 1 N Type Thermocouple
0 0 1 1 0 R Type Thermocouple
0 0 1 1 1 S Type Thermocouple
0 1 0 0 0 T Type Thermocouple
0 1 0 0 1 100 Ω Pt α 0.385
0 1 0 1 0 200 Ω Pt α 0.385
0 1 0 1 1 500 Ω Pt α 0.385
0 1 1 0 0 1000 Ω Pt α 0.385
0 1 1 0 1 100 Ω Pt α 0.3916
0 1 1 1 0 200 Ω Pt α 0.3916
0 1 1 1 1 500 Ω Pt α 0.3916
1 0 0 0 0 1000 Ω Pt α 0.3916
1 0 0 0 1 10 Ω Cu α 0.426
1 0 0 1 0 100 Ω Ni α 0.618
1 0 0 1 1 120 Ω Ni α 0.672
1 0 1 0 0 604 Ω NiFe α 0.518
1 0 1 0 1 R 0 to 150 Ω
1 0 1 1 0 R 0 to 1000 Ω
1 0 1 1 1 R 0 to 3000 Ω
1 1 0 0 0 +/- 50 mV
1 1 0 0 1 +/- 100 mV
1 1 0 1 0 0 to 5V
1 1 0 1 1 1 to 5V
1 1 1 0 0 +/- 10V
1 1 1 0 1 0 to 10V
1 1 1 1 0 4 to 20 mA
1 1 1 1 1 0 to 20 mA
Input Filter
Bit 7 Bit 6 Bit 5 ADC Filter:
0 0 0 4.17 Hz
0 0 1 10.0 Hz
0 1 0 16.7 Hz
0 1 1 19.6 Hz
1 0 0 62.0 Hz
1 0 1 470.0 Hz
1 1 0 *Unused
1 1 1 *Unused
Data Format
Bit 10 Bit9 Bit 8 Format:
0 0 0 Engineering Units
0 0 1 Engineering Units X10
0 1 0 Raw/Proportional Counts
0 1 1 Scaled for PID
1 0 0 Percent of Full Scale
1 0 1
1
CJC EU
1 1 0
1
CJC Scaled for PID
1 1 1
1
CJC Percent of Full Scale
1
If selected, the CJC format will override all ranges/formats and report the
indicated CJC value for this channel. Channel zero will report CJC0
directly. Channel 7 will report CJC1 directly. All others will be distributed
values between CJC0 and CJC1 based on channel position.
BIM Ch n (Broken Input Mode Channel n)
Bit 13 Bit 12
1
Broken Input Mode:
0 0 Zero analog value on broken input.
0 1 Set analog value to Max scale on broken input.
1 0 Set analog value to Min scale on broken input.
1 1 Previous Value
DC Ch n (Disable CJC for Channel n)
State Function
0 CJCs Enabled
1
1 CJCs Disabled
1
1
This field is only used if the input type is a
thermocouple and the format is not a CJC
format. No compensation is performed on the
thermocouple when disabled.
˚F Ch n (Temperature Units for Channel n)
State Function
0 Degrees C
1 Degrees F
TypeofInput ConnectTheFollowing
R IN+ IN‐ I Shield
1
RTD/Res2‐wire1 2
RTD/Res3‐wire 0 1 2
Thermocouple1 2
V/mVSource1 2
mASource1 2 3
1
Shieldcanbeconnectedtochassisgroundterminals16,33,
and40…45.
Input CJCSensor
+ Chassis
Ground
‐ CJC
Tail
1
CJC1 C37 C38 C39 A1
CJC2 C‐46 C‐47 C‐48 B31
1
Terminals37,38,and39,and46,47,and48areforcoldjunction
compensation(with38and47chassisGND).ConnectthetailofCJC1
toterminal1andCJC2toterminal31ifchannels0…3or0…7are
configuredforthermocouples.
The power supply in the current loop to the current inputs
(I/O) of the devices may only be an Isolated Secondary
Limited Voltage, Class 2, or Limited Voltage/Current power
supply.
+
mV
-
+
mA
-
RTD
/
Resistance
2‐wire
0
2
3‐wire
Thermocouple
1
2
+
‐
mVSource
1
2
mASource
1
2
3
1
0
2
1
Jumper
Numbers 0, 1, 2, and 3 are wiring numbers
of the sensor used. For terminal numbers
corresponding to R, IN+, IN-, I, refer to
Terminal Base Unit Wiring Connections
below.
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