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OM-USB-TC-AI User's Guide
Signal I/O Connections
11
OM-USB-TC-AI screw terminal descriptions
Pin
Signal Name
Pin Description
Pin
Signal Name
Pin Description
1
RSVD
Reserved, Do Not Use
27
GND
2
NC
28
V3L
V3 voltage input (-)
3
T0H
T0 sensor input (+)
29
V3H
V3 voltage input (+)
4
T0L
T0 sensor input (-)
30
GND
5
4W01
T0/T1 4-wire, 2 sensor common
31
V2L
V2 voltage input (-)
6
RSVD
Reserved, Do Not Use
32
V2H
V2 voltage input (+)
7
T1H
T1 sensor input (+)
33
GND
8
T1L
T1 sensor input (-)
34
V1L
V1 voltage input (-)
9
GND
35
V1H
V1 voltage input (+)
10
RSVD
Reserved, Do Not Use
36
GND
CJC sensor
11
RSVD
Reserved, Do Not Use
37
V0L
V0 voltage input (-)
12
NC
38
V0H
V0 voltage input (+)
13
T2H
T2 sensor input (+)
39
GND
14
T2L
T2 sensor input (-)
40
CTR
Counter Input
15
4W23
T2/T3 4-wire, 2 sensor common
41
DIO7
Digital Input/Output
16
RSVD
Reserved, Do Not Use
42
DIO6
Digital Input/Output
17
T3H
T3 sensor input (+)
43
DIO5
Digital Input/Output
18
T3L
T3 sensor input (-)
44
DIO4
Digital Input/Output
19
GND
45
DIO3
Digital Input/Output
20
RSVD
Reserved, Do Not Use
46
DIO2
Digital Input/Output
21
+5V
+5V output
47
DIO1
Digital Input/Output
22
GND
48
DIO0
Digital Input/Output
23
NC
49
GND
24
NC
50
NC
25
NC
51
NC
26
NC
52
NC
Use 16 AWG to 30 AWG wire for your signal connections.
Tighten screw terminal connections
When making connections to the screw terminals, be sure to tighten the screw until tight. Simply touching the
top of the screw terminal is not sufficient to make a proper connection.
Voltage input terminals (±V0H/V0L to ±V3H/V3L)
You can connect up to four voltage inputs to the voltage channels (V0H/V0L to V3H/V3L). The input range is
software programmable for ±10 V, ±5 V, ±2.5 V, or ±1.25 V. Each voltage channel is software configurable for
differential or single-ended mode.
When connecting differential inputs to floating input sources, you must provide a DC return path from each
differential input to ground. One way to do this is to connect a resistor from one side of each of the differential
inputs to GND. A value of approximately 100 kΩ can be used for most applications.
Caution!
All ground pins on the OM-USB-TC-AI (pins 9, 19, 22, 27, 30, 33, 36, 39, 49) are common and
are isolated from earth ground. If a connection is made to earth ground when using digital I/O and
conductive thermocouples, the thermocouples are no longer isolated. In this case, thermocouples
must not be connected to any conductive surfaces that may be referenced to earth ground.
Thermocouple input terminals (T0H/T0L to T3H/T3L)
You can connect up to four thermocouples to the differential sensor inputs (T0H/T0L to T3H/T3L). The OM-
USB-TC-AI supports type J, K, R, S, T, N, E, and B thermocouples. You can mix thermocouple types (J, K, R,
S, T, N, E, and B).
Содержание OM-USB-TC-AI
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