Siemens S7 MPI Channel Tag

Introduction

The Siemens S7 Serial MPI Channel Tag provides a Siemens S7 MPI serial communication channel to S7-300 and S7-400 PLC Devices.

The channel supports these MPI adapters:

HMI Adapter, for example 6ES7 972-0CA11-0XA0
PC Adapter, for example 6ES7 972-0CA23-0XA0 or 6ES7 972-0CA22-0XA0, or 6ES7 972-0CA21-0XA0
TS Adapter, for example 6ES7 972-0CA34-0XA0, or 6ES7 972-0CA33-0XA0, or 6ES7 972-0CA32-0XA0

Configuration Properties

The Siemens S7 MPI Channel Tag supports the properties of the Siemens S7 Serial Channel Tag plus these properties:

Property	Type	Version	Description
Port	WSTRING	1.4	The name of the communications port. For example 'COM1:'
Mode	WSTRING	1.4	The serial port communication speed, data format and handshake mode. Click the Browse button to edit the serial port mode using the Serial Port Mode Editor. You can also type in the serial port mode string directly. See Serial Port Mode String for how this property is formatted.
AdapterType	USINT	1.4	The adapter type: HMI (972-0CA1x), PC (972-0CA2x), or TS (972-0CA3x)
HostAddress	USINT	1.4	The adapter host address.
BusSpeed	USINT	1.4	The MPI bus speed: 19.2 Kbps (kilobits per second), 187.5 Kbps, 500 Kbps, 1500 Kbps.
HighestAddress	USINT	1.4	The highest address on the MPI bus.
SingleMaster	BOOL	1.4	True if Fernhill SCADA is the only master on the MPI bus. False if Fernhill SCADA shares the MPI bus with other masters.

Note: The Fernhill SCADA Siemens S7 Driver will automatically configure HMI or PC adapters using the HostAddress, BusSpeed, HighestAddress, and SingleMaster configuration properties. The Teleservice adapter type (TS) is preconfigured using the Siemens Teleservice configuration tool. The HostAddress, BusSpeed, HighestAddress, and SingleMaster configured in Fernhill SCADA are not used.

MPI Adapter Baud Rates and Frame Formats

The different types of MPI Adapter support different baud rates depending on the exact model and version. Use this table to select the appropriate mode string for an adapter type:

Adapter Type	Supported mode strings
HMI (6ES7 972-0CA11-0XA0)	Baud=9600 Parity=O Data=8 Stop=1
PC (6ES7 972-0CA23-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1
PC (6ES7 972-0CA22-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1
PC (6ES7 972-0CA21-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1
TS (6ES7 972-0CA34-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1
TS (6ES7 972-0CA33-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1
TS (6ES7 972-0CA32-0XA0)	Baud=19200 Parity=O Data=8 Stop=1 Baud=38400 Parity=O Data=8 Stop=1

Tag Commands

The Siemens S7 Serial MPI Channel Tag supports the tag commands of the Siemens S7 Serial Channel Tag.

Example Configuration

This is an example of a channel configured to support connection via a PC Adapter to a Siemens S7-300 PLC via COM1:

Property	Value
ReplyTimeout	1s
Port	COM1
AdapterType	PC (972-0CA2x)
Mode	Baud=38400 Parity=O Data=8 Stop=1
HostAddress	1
BusSpeed	187.5 Kbps
HighestAddress	15
SingleMaster	False

Relationships to Other Tag Types

The Siemens S7 Serial MPI Channel Tag builds on the features of these tag types:

Further Information

Siemens S7 Driver

For information on the Siemens S7 Driver.

Serial connection using an MPI Adapter

To learn about connecting Fernhill SCADA to Siemens S7-300 or S7-400 PLC Devices using an MPI Adapter.

Channel Tag

To learn about the Siemens S7 Serial Channel.

Alarm Conditions

To learn about abnormal conditions in SCADA applications.

Serial Port Mode Editor

To learn how to set the communications speed, data format, and handshake mode of the serial port.

Glossary

For the meaning of terms used in Fernhill SCADA.