Siemens S7 Ethernet PLC Tag

Introduction

The Siemens S7 Ethernet PLC Tag provides a logical link to a Siemens S7 PLC via an Ethernet network.

Configuration Properties

The Siemens S7 Ethernet PLC Tag supports the configuration properties of the Siemens S7 PLC Tag plus these properties:

Property	Type	Version	Description
Channel	Reference	1.4	The Siemens S7 Ethernet Channel Tag to the PLC.
DestinationTSAP	WSTRING	1.4	The Transfer Service Access Point within the PLC.
SourceTSAP	WSTRING	1.4	The Transfer Service Access Point of Fernhill SCADA.

Channel Property

Note: Only one Siemens S7 Ethernet PLC Tag can reference any one Siemens S7 Ethernet Channel Tag. If you wish to connect to multiple Siemens S7 PLC Devices using Ethernet, configure a separate Siemens S7 Ethernet Channel Tag for each PLC.

DestinationTSAP and SourceTSAP Properties

To establish a connection between Fernhill SCADA and a Siemens PLC, you need to configure appropriate values for the DestinationTSAP and SourceTSAP properties. The values you should enter depend on:

The type of PLC
The configuration of the PLC
Whether preconfigured connections are used.

If you are not using preconfigured connections use these values for the SourceTSAP and DestinationTSAP properties:

PLC Type	SourceTSAP	DestinationTSAP
S7-200	4D.57	4D.57
S7-300	01.00	02.02
S7-400	01.00	02.X Where: X = CPU Rack * 32 + CPU Slot
S7-1200	01.00	02.01

Note: The number of available connections using these TSAP values may be limited. Fernhill SCADA may not connect if all the available connections are in use.

Using a preconfigured connection ensures that Fernhill SCADA can establish a connection to the PLC. Using the appropriate PLC configuration tool, create an S7 Connection that acts as a server. Set the SourceTSAP and DestinationTSAP properties in Fernhill SCADA to match the TSAP properties of the S7 Connection configured in the PLC.

Tag Commands

The Siemens S7 Ethernet PLC Tag supports the tag commands of the Siemens S7 PLC Tag.

Relationships to Other Tag Types

The Siemens S7 Ethernet PLC Tag builds on the features of these tag types:

Further Information

Siemens S7 PLC Tag

For properties common to all Siemens S7 PLC Devices.

Siemens S7 Ethernet Channel Tag

For information about the Ethernet channels that can be associated with this type of PLC.

Configuring Tags for Siemens S7 Ethernet Communication

For a guide to manually configure tags for S7 Ethernet Communication.

Alarm Conditions

To learn about abnormal conditions in SCADA applications.

Glossary

For the meaning of terms used in Fernhill SCADA.