Siemens SINUMERIK 840D sl, Function Manual

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Detailed description
2.7 Structure and functions of the basic program
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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Structure of decoding list
The source file for the decoding list (MDECLIST.AWL) is supplied with the basic program.
DB 75 is created when the STL source is compiled.
There must be an entry in decoding list DB 75 for every group of M functions to be decoded.
A maximum of 16 groups can be created.
16 bits are available in each group in the list of decoded signals.
The assignment between the M function with extended address and the bit to be set in the
signal list is specified via the first and last M functions in the decoding list.
The bit address is generated correspondingly from the first M function ("MFirstAdr") to the
last M function ("MLastAdr") from bit 0 up to maximum bit 15 for each group.
Each entry in the decoding lists consists of 3 parameters, each of which is assigned to a
group.
Assignment of groups
Group
Extended
M address
First M address in group Last M address in group
1 MSigGrp[1].MExtAdr MSigGrp[1].MFirstAdr MSigGrp[1].MLastAdr
2 MSigGrp[2].MExtAdr MSigGrp[2].MFirstAdr MSigGrp[2].MLastAdr
... ... ... ...
16 MSigGrp[16].MExtAdr MSigGrp[16].MFirstAdr MSigGrp[16].MLastAdr
Type and value range for signals
Signal
Type Value range Remark
MExtAdr Int 0 ... 99 Extended M address
MFirstAdr DInt 0 to 99.999.999 First M address in group
MLastAdr Dint 0 to 99.999.999 Last M address in group
Signal list
Data block DB 76 is set up when the function is activated.
A bit is set in the appropriate group in DB 76 for an M signal decoded in the list.
At the same time, a readin disable is set in the channel in which the M function has been
output.