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Chapter 3. Program Data
Bit in Word references can be used in the following situations:
In retentive 16-bit memory (AI, AQ, R, W, P, and L) and symbolics.
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On all contacts and coils except legacy transition contacts (POSCON/NEGCON) and transition
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coils (POSCOIL/NEGCOIL).
On all functions and call parameters that accept single or unaligned bit parameters.
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Restrictions
The use of Bit in Word references has the following restrictions:
Bit in Word references cannot be used on legacy transition contacts (POSCON/NEGCON) and
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transition coils (POSCON/NEGCON).
The bit number (index) must be a constant; it cannot be a variable.
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Bit addressing is not supported for a constant.
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Indirect references cannot be used to address bits in 16-bit memory.
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You cannot force a bit within 16-bit memory.
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Examples:
%R2.X [0] addresses the first (least significant) bit of %R2
%R2.X [1] addresses the second bit of %R2. In the examples
In the examples [0] and [1] are the bit indexes. Valid bit indexes for the different variable types are:
38
PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual
Functions that accept
unaligned discrete references
ARRAY MOVE (BIT)
ARRAY RANGE (BIT)
MOVE (BIT)
SHFR (BIT)
BYTE variable
WORD, INT, or UINT variable
DWORD or DINT variable
Parameters
SR and DS
Q
IN and Q
IN, ST and Q
[0] through [7]
[0] through
[15]
[0] through
[31]
GFK-2950C
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