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These resistor locations connect the high side to the low side of the
corresponding channels, thereby acting as shunts. If, for example,
you add a 250 Ω resistor to location R17, and connect a 4 to 20 mA
current loop input to channel 0, the input range is converted to 1 to
5 V. Note that, depending on your application, you may need to use
resistors R1 to R16 with resistors R17 to R32 for proper operation.
Refer to
page 74
Configuring the STP268-EC Screw Terminal Panel
This section describes how to configure an STP268-EC screw terminal
panel for use with analog output modules on the 5B01 and 7BP16-1
signal conditioning backplanes.
Note: You cannot use analog output modules on the 5B08, 7BP04-1,
or 7BP08-1 backplane.
By default, the 5B01 and 7BP16-1 backplanes map to single-ended
analog input channels 0 to 15. However, you can use channels 14 and
15 on the 5B01 or 7BP16-1 backplane as analog output channels 0 and
1.
You can determine how channels 14 and 15 are used on the 5B01 and
7BP16-1 backplanes using jumpers on the STP268-EC screw terminal
panel.
To use channels 14 and 15 on the 5B01 or 7BP16 backplane as analog
inputs, remove jumpers W1 through W4 on the STP268-EC screw
terminal panel.
To use channel 14 on the 5B01 or 7BP16 backplane as analog output
channel 0, install jumper W1 (DAC0 Ground) and W2 (DAC0) on the
STP268-EC screw terminal panel.
Attaching and Configuring a Screw Terminal Panel
for an example of using current shunt resistors.
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