Rockwell Automation 1791D-XXXX CompactBlock I/O for DeviceNet Modules Series D I.I. - Manual (Page 16)

16 CompactBlock I/O for DeviceNet Modules Series D
Publication 1791D-IN003A-EN-P - June 2003
The module produces 1 byte for every 8 inputs. Similarly, the module
consumes 1 byte for every 8 outputs. When an expansion module is
connected, an additional byte will be returned indicating the health of
the expansion module.
Remember, though, when configuring your CompactBlock I/O
application, these values are entered as bytes received (R
x
) and bytes
transmitted (T
x
) by the scanner.
For example, a Base input module produces 2 bytes and consumes 0
bytes. In such a case, the scanner connected to the Base Input
module will receive (R
x
) 2 bytes and transmit (T
x
) 0 bytes.
Word/Bit Definitions
The following table lists the combination of input and output
modules and the input and output bytes produced and consumed.
IMPORTANT
When installing an expansion module, refer to the
table below to see how many bytes are produced
and consumed by the modules.
Digital Expander
Base Expansion I/O Points Produced
(input bytes)
Consumed
(output bytes)
16 input 16 in 2 0
16 output 16 out 0 2
8 in / 8 out 8 in / 8 out 1 1
4 in 4 in 1 0
4 in / 4 out 4 in / 4 out 1 1
8 out 8 out 0 1
16 input 16 input 32 input 5 0
16 input 16 output 16 in / 16 out 3 2
16 output 16 input 16 in / 16 out 3 2