Rockwell Automation GMLC Reference Manual - Manual (Page 657)

Publication GMLC-5.2 - November 1999
620 System Functions
Optional Masks
Use a bit mask to exclude or mask unwanted inputs (bits) from the input
group. Using a bit mask lets you create an input group consisting of non-
contiguous inputs. For example, you can use a bit mask to create a group
consisting of four inputs, starting at input #2 and running through input
#5, but excluding input #3.
The bit mask is the sum of the binary value of each group input bit whose
signal is read. The binary value of each group input bit whose signals are
not read are excluded from this sum. The following table lists the binary
values for up to 16 bits:
For this bit
in an input group
Use this Binary Value
1
st 1
2
nd 2
3
rd 4
4
th 8
5
th 16
6
th 32
7 th 64
8
th 128
9
th 256
10 th 512
11
th 1,024
12
th 2,048
13 th 4,096
14
th 8,192
15 th 16,384