Rockwell Automation Allen-Bradley DeviceNet 193-DNCT, User Manual

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Rockwell Automation Publication 193-UM009B-EN-P - February 2013 59
Zone Interlock Protocol (ZIP) Chapter 14
The following screen shows the EPR (Expected Packet Rate) field highlighted:
The following screen shows the IO Msg field highlighted:
Note : The IO Msg field may also be referred to as the Zone Mask field.
The following screen shows that byte 0 and byte 2 of the I/O data from node 5
are mapped to the ZIP data table. To accomplish this the IO Msg field must be
mapped to the value of “00000101”. Press the
Enter key to edit the IO Msg field
value. After editing, the value the screen will appear as follows:
EPR (Expected Packet Rate) allows
the expected packet rate of the I/O
data from node (Node 5) to be
changed. This value is in
milliseconds.
The “IO Msg:” field allows the choice
of which bytes of the I/O data from
node 5 are going to be mapped to
the ZIP data table. Each bit in the IO
Msg field maps or un-maps a byte of
the I/O data from node 5. The value
1 means map this byte of I/O data. In
this example, only byte 0 of the I/O
data from node 5 is being mapped.
This 1 maps” byte 2
of the IO data from
node 5
Two bytes of I/O data
from node 5 are now
mapped to the
internal ZIP data
table
This 1 maps
byte 0 of the
IO data from
node 5