Data Table
Chapter 3
328
Figure 3.12
Example
of Sequencer Table Bit Assignments
SEQUENCER
COUNTER
ADDR:
FILE
to
SEQ LENGTH
WORD ADDR:
MASK ADDR:
MASK
STEP
17 1007 00
FROM ADDR
TO ADDR
17 1007 00 17 1007 00 17 1007 00
WORD #1 WORD #2 WORD #3 WORD #4
D
E
V
I
C
E
N
A
M
E
1010 011 0101010101010 011 0101010101010 011 010101010
0010 100 0100100101010 011 0101010101010 011 010101010
ABF8EA4CA3D9
3C4D2812B5F4
1DC134D2
CFF265ECH127F
CD461
47D239B1ABC6
B3F823FE1C2A
400 410 420
407 417 427
1
2
3
4
6
7
A
//// /// ///////////// /// ///////////// /// /////0000
Input
204 400 427
112 113 114
403 431 432
1
Once the rough sketch of the application is complete, the programmer can
assign data table bit addresses to the input and output devices wired to the
controller. The 5-digit bit address directly corresponds to the location of
each I/O device with respect to the rack number, I/O group and terminal
number. Because the bit address is hardware-related, the programmer
cannot arbitrarily assign bit addresses to I/O devices. Refer to Section
3.2 on memory organization. Analog modules and other intelligent I/O
modules use word addresses rather than 5-digit bit addresses. Refer to the
user’s manual for each module for more information on addressing and
wiring.
The installer and programmer of the PLC-2/30 Programmable Controller
should work together to determine the best placement of the I/O modules
within the I/O chassis. To simplify installation and troubleshooting
procedures, it may be desirable to group like modules together. It is also
helpful to document I/O assignments on a form such as the form presented
at the end of this section. Recommendations for I/O wiring and module
3.4.6
I/O Assignments
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