Communication with LOGO! modules by Siemens

For easy integration of this driver into the application it is handy to use:

- The addresses in LOGO! modules start from 1, but in the S7 protocol addresses start from 0.

- Values in data areas (e.g. in I, Q, M areas, etc.) are of the Bit type, but in the S7 protocol these are of the Byte type (i.e. 8 LOGO! values can "fit into" a single S7 value). Therefore it is necessary to recount the LOGO! addresses when entering into S7 addresses. Example:

- LOGO! has the VM data area thet is also available in S7 in the DB1 datablock. Other areas can be mapped into this area:

Data area	VM address - from	VM address - to	Range	S7 address
I	1024	1031	8 Bytes	I1 = DB1,X1024.0 = I0.0
AI	1032	1063	32 Bytes	AI1 = DB1,W1032
Q	1064	1071	8 Bytes	Q1 = DB1,X1064.0 = Q0.0
AQ	1072	1103	32 Bytes	AQ1 = DB1,W1072
M	1104	1117	14 Bytes	M1 = DB1,X1104.0 = M0.0
AM	1118	1245	128 Bytes	AM1 = DB1,W1118
NetI	1246	1261	16 Bytes	NetI1 = DB1,X1246.0
NetAI	1262	1389	128 Bytes	NetAI1 = DB1,W1262
NetQ	1390	1405	16 Bytes	NetQ1 = DB1,X1390.0
NetAQ	1406	1469	64 Bytes	NetAQ1 = DB1,W1406

- Date and time can also be mapped into the VM area:

VM address	Value	Range	S7 address
984	Diagnostic Bits Array	1 Byte	DB1,B984
985	year	1 Byte	DB1,B985
986	month	1 Byte	DB1,B986
987	day	1 Byte	DB1,B987
988	hour	1 Byte	DB1,B988
989	minute	1 Byte	DB1,B989
990	second	1 Byte	DB1,B990

- Name: S7-200 PC-Access V1.0.

- See: https://support.industry.siemens.com/#document/58495870

- Follow these recommendations for the OPC server: