Spectrum Controls 1769 Series User Manual page 76

E-4 Compact™ IO Isolated Thermocouple Module
User's Manual Pub. 0300244-02 Rev. A
1769-ADN. From the module list on the left, select the 1769sc-IT6I. The
module should appear in the empty slot. Double-click on the 1769sc-IT6I
module in slot 1 and the following 1769sc-IT6I configuration screen appears:
Enter 1 into the bank field at the bottom of the screen.
By default, the 1769sc-IT6I module contains eight input words and no output
words. Click on the "Advanced Parameters" tab. This screen allows you to
change the input data size. You can select from 1 word all the way up to the
default, which is 8 words. Click OK or CANCEL to exit this screen and return to
the Configuration screen.
You may leave the Electronic Keying to "Compatible Module". It is not
recommended to Disable Keying, but if you are not sure of the exact revision of
your module, selecting Compatible Module requires that a 1769sc-IT6I module
be installed in slot 1.
Click on the "Configuration Settings" tab. Each of the 6 thermocouple input
channels are enabled by default. To disable a channel, double-click on the
channel number and change the enable state to disabled. Go ahead and finish the
module configuration by choosing your Data Format, Input Type, Temperature
Units, Open-Circuit Condition and Filter Frequency for each channel you intend
to use. See Channel Configuration on page 3-3 for a complete description of
each of these configuration categories.
In this example, channels 0 through 5 are being used. All 6 channels have J-type
thermocouples connected. A 10 Hz Filter Frequency (the default) is used for all
6 channels, along with receiving the thermocouple input data in Engineering
Units. We also chose °F for the Temperature Units. This selection, coupled with
choosing Engineering Units for the data format allows us to receive the data into
the controller's tag database as actual temperature data in °F. The Open-Circuit
Detection is Upscale. This means that if an open-circuit condition should occur at
any of the 6 thermocouple input channels, the input value for that channel is the
full-scale value selected by the input type and data format. We can therefore
monitor each channel for full scale (open-circuit) as well as monitor the Open-
Circuit bits in Input word 6, for each channel.