Rockwell Automation 1771-VHSC , D17716.5.74 Very High S - Manual (Page 8)

Using This Manual P–2
Topics Covered Title Chapter
Appendices
A Specifications Specifications for the VHSC module.
B Sample Programs Sample programs for various PLC programs.
C Application Considerations Selection of input devices and circuit descriptions.
D Questions and Answers Helpful answers to the most asked questions.
E Period/Rate and Continuous/Rate Examples Examples of the differences of these 2 modes
You can install your input module in any system that uses
Allen-Bradley programmable controllers with block transfer
capability and the 1771 I/O structure.
Contact your nearest Allen-Bradley office for more information
about your programmable controllers.
This module can be used with any 1771 I/O chassis. Communication
between the module and the processor is bidirectional. The PLC
sends module information using block transfer write instructions and
the 1771 I/O backplane. The PLC receives module status information
through block transfer read instruction and places it in the data table.
I/O image table use is an important factor in module placement and
addressing selection. The module’s data table use is listed in the
following table.
Table P.A
Compatibility and Use of Data Table
Catalog
Number
Use of Data Table
Input Output Read Write
Image Image Block Block
Bits Bits Words Words
Compatibility
Addressing Chassis
1/2 Ćslot 1Ćslot 2Ćslot Series
1771ĆVHSC Rev. A 8 8 18 max 64 max Yes See note See note A and B
1771ĆVHSC Rev. B 8 8 26 max 64 max Yes See note See note A and B
A = Compatible with 1771ĆA1, A2, A4 chassis.
B = Compatible with 1771ĆA1B, A2B, A3B, A4B chassis.
Yes = Compatible without restriction
NOTE: Ć Restricted to complementary module placement (refer to chapter 2)
For a list of publications with information on Allen-Bradley
programmable controller products, consult our publication index
SD499.
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