4ć19 – Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL User Manual
Page 94
Planning Your Application
Chapter 4
4-19
Table 4.H
Bits Required for BCD Digits
Number of BCD Digits
Bits Required
БББББББББББ
БББББББББББ
1
ББББББББББББ
ББББББББББББ
4
БББББББББББ
БББББББББББ
2
ББББББББББББ
ББББББББББББ
8
БББББББББББ
БББББББББББ
3
ББББББББББББ
ББББББББББББ
12
БББББББББББ
БББББББББББ
4
ББББББББББББ
ББББББББББББ
16
БББББББББББ
БББББББББББ
5
ББББББББББББ
ББББББББББББ
20
БББББББББББ
БББББББББББ
6
ББББББББББББ
ББББББББББББ
24
БББББББББББ
БББББББББББ
7
ББББББББББББ
ББББББББББББ
28
БББББББББББ
БББББББББББ
8
ББББББББББББ
ББББББББББББ
32
Bit Position Data Type—when you assign a bit position data type to a
dynamic object or window, each state of the object will correspond to a
unique bit in the assigned address (contiguous bit string).
The number of bits required is one (1) less than the maximum number
of states since All Bits Off is a state in itself (state 0). This applies to
objects but not message windows.
It is possible for the bit string to extend into the next word, but not past
the end of a rack assignment or block transfer file.
The bit position data type can also be used for objects that are controlled
by PLC outputs. For example, you could configure a Multi-State
Indicator to have twelve states, each with unique text and attributes. The
PLC output address would then be an eleven-bit string. Whichever bit
the PLC controller set would determine which state PanelView displays.
If more than one bit is set at a time, PanelView will consider only the
lowest bit set when assigned to Multi-State indicator.
The Alarm window, Local Message Display and Information window
can use bit strings up to 496 bits long.
If you use the bit position data type with the Alarm window, PanelView
will monitor all the bits in the bit string. Thus, the PLC controller can
set any number of bits simultaneously, and the Alarm window will scroll
through all the alarms with bits set, time-stamped and in lowest bit to
highest bit order.
Number of Bits
Use the “Number of Bits” column to document the specific number of bits
required by an object’s address assignment. The number of bits is
determined by the number of states and the data type.