13. Program Support Functions
13.5 User Macro Specifications
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(4) Bit designation (#100103)
(a) System variable for bit designation
The bit to be read in is designated by substituting the bit designation value in this system
variable.
This designation is valid only when reading the bits for a 16-bit device, and is invalid in all
other cases.
If the data is read without designating this number, the data will be read in the same
manner as if the minimum bit designation value (0: bit 0) is designated. Once designated,
the setting is held until the bit is designated again or until it is reset.
A program error (P39) will occur if a bit that does not exist is set.
(b) Bit designation values
Bit designation
value
Read in bit
0 Bit
0
1 Bit
1
: :
15 Bit
15
(5) PLC data read (#100110)
The data for the designated device is read in with this system variable.
Refer to the table for number of bytes designation for details on the range of data read in.