Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 46)

Configuring the Scanner through LIST
Chapter 2
2-20
12 - DH+ Active Nodes to Status File 6
Select the DH+ Active Nodes to Status File 6 option from the
configuration screen to maintain the DH+ active node table in status file 6.
The list of active nodes is stored in status file 6. If you enable this option,
you must also create status file 6.
Status file 6 is partitioned into 4 words for each of the 15 possible scanner
thumbwheels. To provide for 15 scanners, you must create S6:59. Each of
the 64 bits contained in the 4 word groups represent the possible DH+
station numbers of 0 through 77 octal.
If the bit is a: Then the station represented by that bit is:
1 active on the link.
0 not on the link.
Important: This table is updated even when the system is in
program mode.
The rack range selection in LIST sets the range of assigned I/O rack
numbers. The default setting for the rack number range is 0-76
8
.
If you plan to use rack numbers greater than 37
8
, consider the following:
Each instruction in the ladder program that addresses an input or output
in a rack greater than 37
8
uses one additional word of memory and
increases the program scan time. Typically, the program scan increases
about 0.01 milliseconds for each relay logic instruction (XIC, XIO,
OTE, OTL, OTU) that address a bit in a rack greater than 37
8
.
The amount of memory required for the input and output sections
depends on the highest rack number containing input or outputs
respectively. Therefore, skipping rack numbers wastes memory.
The list configurable items for scanner number 1 also include selections for
front panel channel 0, and the front panel data access display.
Select: To enable you to set:
channel 0 parameters for the RSĆ232ĆC port labeled CHANNEL 0 on the front panel.
The parameter selections are described in the following sections.
display the privileges for the front panel display. These privileges determine what
you are allowed to accomplish through the front panel keypad. The
default for these privileges is 3, 10, 67, 69, and 70.
Setting the Rack Range
Configuring the Front Panel