Measurement Computing WEB-TC - Manual (Page 18)

WEB-TC User's Guide Signal I/O Connections
18
WEB-TC screw terminal descriptions
Pin Signal Name Pin Description Pin Signal Name Pin Description
1 RSVD* Reserved 27 RSVD* Reserved
2 NC* No connect 28 AGND Analog ground
3 C0H CH0 sensor input (+) 29 C7L CH7 sensor input (-)
4 C0L CH0 sensor input (-) 30 C7H CH7 sensor input (+)
5 RSVD* Reserved 31 RSVD* Reserved
6 RSVD* Reserved 32 RSVD* Reserved
7 C1H CH1 sensor input (+) 33 C6L CH6 sensor input (-)
8 C1L CH1 sensor input (-) 34 C6H CH6 sensor input (+)
9 AGND Analog ground 35 NC* No connect
10 RSVD* Reserved 36 RSVD* Reserved
11 RSVD* Reserved 37 RSVD* Reserved
12 NC* "No Connect" 38 AGND Analog ground
13 C2H CH2 sensor input (+) 39 C5L CH5 sensor input (-)
14 C2L CH2 sensor input (-) 40 C5H CH5 sensor input (+)
15 RSVD* Reserved 41 RSVD* Reserved
16 RSVD* Reserved 42 RSVD* Reserved
17 C3H CH3 sensor input (+) 43 C4L CH4 sensor input (-)
18 C3L CH3 sensor input (-) 44 C4H CH4 sensor input (+)
19 AGND Analog ground 45 NC* No connect
20 RSVD* Reserved 46 RSVD* Reserved
21 +5V +5V output 47 NC* No connect
22 PU/D Pull-up/down for digital outputs 48 GND Digital ground
23 DIO0 Digital Input/Output 49 DIO7 Digital Input/Output
24 DIO1 Digital Input/Output 50 DIO6 Digital Input/Output
25 DIO2 Digital Input/Output 51 DIO5 Digital Input/Output
26 DIO3 Digital Input/Output 52 DIO4 Digital Input/Output
*Make no connection to terminals labeled NC or RSVD .
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.
Thermocouple input terminals (C0H/C0L to C7H/C7L)
You can connect up to eight thermocouples to the differential sensor inputs (C0H/C0L to C7H/C7L).
The WEB-TC supports type J, K, R, S, T, N, E, and B thermocouples. The thermocouple type you select will
depend on your application needs. Review the temperature ranges and accuracies of each type to determine
which is best suited for your application. You can connect a different thermocouple type to each channel.
CJC sensors
The WEB-TC has four built in high-resolution temperature sensors for thermocouple measurements. Each CJC
sensor is dedicated to two thermocouple input channels, and is located behind the associated channel's screw
terminal. These sensors measure the ambient temperature at the terminal block so that the cold junction voltage
can be calculated.
Digital terminals (DIO0 to DIO7)
You can connect up to eight digital I/O lines to the screw terminals labeled DIO0 to DIO7 . Each terminal is
software configurable for input or output. A PU/D terminal is provided for pull-up/down configuration
(explained on page 19).
If a digital bit is set up as an alarm, the bit is configured for output and assumes the state defined by the alarm
configuration.