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Series 90–70 Remote I/O Scanner Use’s Manual – July 1992132
2. Add the contribution of each I/O module in the remote drop. For discrete input
modules, the contribution is either 36 bytes for modules with catalog numbers
IC697MDL2nn (for example, IC697MDL241) or 42 bytes for modules with catalog
numbers IC697MDL6nn.
3. Include 50 bytes as the contribution of the Remote I/O Scanner itself.
4. Option (PCM, GDS, ADS) modules do not have I/O configuration data, so they are
not included in the calculation. Chapter 1 explains how many option modules can
be in a remote drop.
Example 1
A remote drop has 10 discrete input modules with model numbers IC697MDL2nn and
14 with model numbers IC697MDL6nn, 15 discrete output modules, 3 analog input
modules, and 2 analog output modules, for a total of 44 I/O modules altogether. The
1974 bytes of configuration data is well within the configurable limit of 4500 bytes.
Number of I/O Data Types 4 36 144
(%I, %AI, %Q, %AQ)
Discrete Input Modules, MDL2nn 10 36 360
Discrete Input Modules, MDL6nn 14 42 588
Discrete Output Modules 15 38 570
Analog Input Modules 3 150 450
Analog Expander Modules 0 22 0
Analog Output Modules 2 86 172
Remote I/O Scanner 1 50 50
Description
Number
of Each
Multiply by
Bytes Each
=
Contribution
Total
1974
Example 2
A remote drop is planned with 16 analog input modules, 20 analog output modules, 4
discrete input modules with model numbers IC697MDL6nn, and 4 discrete output
modules, for a total of 44 I/O modules altogether. This is the same number of modules
used in example 1.
This would be an invalid configuration; it would not be accepted by a Remote I/O
Scanner. It would be necessary to remove some I/O modules from the remote drop to
bring its configuration data below the maximum limit.
Number of I/O Data Types 4 36 144
(%I, %AI, %Q, %AQ)
Discrete Input Modules, MDL2nn 0 36 0
Discrete Input Modules, MDL6nn 4 42 168
Discrete Output Modules 4 38 152
Analog Input Modules 16 150 2400
Analog Expander Modules 0 22 0
Analog Output Modules 20 86 1720
Remote I/O Scanner 1 50 50
Description
Number
of Each
Multiply by
Bytes Each
=
Contribution
Total
4634