Communication with LOGO! modules by the Siemens company

Logical modules LOGO! are suitable for both industrial usage and BMS systems. Examples of usage:

- Simple monitoring and control

- Building automation

- Remote monitoring and control of smaller machines

- Basic energi monitoring

- Location monitoring for logistics applications

- and many others

Communication with LOGO! 8 logical modules

The LOGO! 8 module (OBA8) supports Ethernet commnication by the S7 protocol. LOGO! 8

For this communication in the PROMOTIC system can be used:

- PmS7 - Driver for communication by the S7-TCP/IP protocol
For easy integration of this driver into the application it is handy to use:

- Preconfiguration "PmS7 - LOGO! 8 - Ethernet - Communication set with data and panel"

Settings S7 protocol parameters for LOGO! 8:

- Communication type = Ethernet ISOonTCP Standard

- Max. PDU length = 960

- Rack = 0

- CPU Slot = 1

- Connection type = 2 = OP-connection

Notes concerning definition of variable address (definition of ItemId):

- 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:

M1 -> M0.0

M8 -> M0.7

M9 -> M1.0

- LOGO! has the VM data area that 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

Communication with older logical modules than LOGO! 8

Older module types (LOGO! OBA6, LOGO! OBA7) do not support Ethernet communication by the S7 protocol.
For this communication in the PROMOTIC system can be used: OPC server.

OPC server by the Siemens company:

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

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

- Follow these recommendations for the OPC server:

- Install driver "PC Adapter USB A2 Driverdisk V1.0" - see https://support.industry.siemens.com/#document/78453460

- Run the OPC server as Administrator