Rockwell Automation 1799-D16U16BL 16 Input/16 Output Discrete Embedded I/O - Manual (Page 15)

16 Input/16 Output Digital Embedded I/O Boards 15
Publication 1799-IN004F-EN-P - September 2008
Communicate With Your Board
This board exchanges I/O with the master on the DeviceNet network through a
cyclic, polled, or change-of-state connection.
The 1799-D16U16B and 1799-D16U16BL boards consume and produce I/O data as
follows.
The 1799-D16U16V and 1799-D16U16VL boards consumes and produces I/O data
as follows.
Cyclic — the board produces and consumes its I/O cyclically at the rate configured
by the master on the DeviceNet network.
Polled — the master initiates communication by sending its polled I/O message to
the board. The board consumes the message, updates any outputs, and produces a
response containing the input data.
Change-of-state — a production occurs when an input changes. A heartbeat
production occurs if no input condition change occurs within the expected packet
rate. This heartbeat production tells the master that the board is ready to
communicate. Consumption occurs when data changes and the master produces
new output data to the board.
Refer to this table for the word and bit definitions for the 1799-D16U16B and
1799-D16U16BL boards.
I/O Connection Type Consumes Produces
Cyclic 2 bytes 3 bytes
Polled 2 bytes 3 bytes
Change-of-state 2 bytes 3 bytes
I/O Connection Type Consumes Produces
Cyclic 2 bytes 2 bytes
Polled 2 bytes 2 bytes
Change-of-state 2 bytes 2 bytes
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Produced 0 I7 I6 I5 I4 I3 I2 I1 I0
Produced 1 I15 I14 I13 I12 I11 I10 I9 I8
Produced 2 Reserved OFLT 1 OFLT 0
Consumed 0 O7 O6 O5 O4 O3 O2 O1 O0
Consumed 1 O15 O14 O13 O12 O11 O10 O9 O8
Where: I = Input, O = Output, OFLT 0 = Output Fault on one or more outputs in GRP 0,
OFLT 1 = Output Fault on one or more outputs in GRP 1