Siemens SINUMERIK 840D sl Function Manual page 852

P3: Basic PLC program for SINUMERIK 840D sl
13.10 Structure and functions of the basic program
Auxiliary and G functions
The auxiliary and G functions have the following characteristics:
● Transfer to the PLC is block-synchronous (referred to a part program block)
● Transfer is acknowledge-driven.
● The acknowledgement times have an immediate effect on the execution time of NC blocks
containing auxiliary functions requiring acknowledgement.
The value range is presented in the table below:
Function
G function
M word
S word
T word
D word
H word
F word
relative number, transferred for each G group
1)
corresponding STEP 7 format (24-bit mantissa, 8-bit exponent)
2)
The M, S, T, H, D and F values sent by the NCK are output together with the accompanying
change signals to the CHANNEL DB interface via the auxiliary/G functions (see List Manual).
The function value and the extended address are transferred to the appropriate data word.
The accompanying modification signal is activated to 1 for one PLC cycle. When the
modification signal is reset, the acknowledgement is passed to the NCK. The
acknowledgement of high-speed auxiliary functions is given by the basic program immediately
the basic program detects the auxiliary function.
In addition to distribution of the auxiliary and G functions, selected signals are processed as
described below.
M decoder
M functions can be used to transfer switching commands and fixed-point values. Decoded
dynamic signals are output to the CHANNEL DB interface for standard M functions (range M00
- M99) signal length = 1 cycle time).
852
Structure
1. Value 2. Value
G function
M group M word
Spindle no. S word
Magazine T word
no.
- D word
H group H word
Axis no. F word
Value range
1. Value 2. Value
255
1)
99 99.999.999
6 Floating
point
2)
99 65535
99 255
99 Floating
point
18 Floating
point
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Data type
1. Value 2. Value
Byte
Word DWord
Word DWord
Word Word
Byte Byte
Word DWord
Word DWord
Basic Functions