Mobile wireless components

The MD720-3 features an RS232 interface and supports the GSM services CSD, SMS and GPRS.

Use with SINAUT MICRO:
Data transmission by means of GPRS. The GPRS connection can be interrupted for the transmission of text messages. In case of teleservice dial-in, the user can temporarily switched from GPRS to CSD.

Use with SINAUT ST7:
Data transmission by means of CSD. Transmission of text messages, where receipt of the text messages can be acknowledged from the mobile phone. The text message can also be output as fax, e-mail, or voice mail.

Use with TS Adapter II
Data transmission by means of CSD as well as sending of text messages.

The MD741-1 features an RJ45 interface and supports the GSM service GPRS.

Use with SINAUT ST7:
Data transmission by means of GPRS. Since data transmission from the GPRS provider to the control center is frequently over the Internet, the MD741-1 has an integral VPN router and firewall. This allows GPRS connections with optimum security to be established between the station and control center.

Use for other applications, e.g. remote maintenance
Remote programming, parameterization and diagnosis can be performed securely via VPN from a service center that is connected over the Internet to machines and plants installed worldwide. All the automation devices connected to the Ethernet port of the MD741-1 can be accessed. For additional information, see SIMATIC NET Configuration 9.

Quadband antenna for MD720-3 and MD740-1. It can be directly connected to the modems and is suitable for indoor and outdoor applications.

GSM services
GSM networks offer different services that can be used for data transmission with SINAUT or other applications:

CSD (Circuit Switched Data)
With this service, data can be transmitted by setting up a dial-up connection over the mobile radio network. The maximum data transfer rate is 9600 bit/s. Data can be transmitted between two stations both from mobile wireless to mobile wireless(from GSM modem to GSM modem) and from mobile wireless to fixed networks (phone or ISDN attachment; ISDN is recommended). The costs for this data service are usually based on the duration of the connection.

SMS (Short Message Service)
This service permits the transmission of text messages, e.g. direct to the on-call personnel. Many providers also offer the option to sent text messages to the receiver as fax, e-mail, or voice mail. Costs are usually based on the number of text messages sent.

GPRS (General Packet Radio Service)
The GPRS service of a GSM mobile radio provider permits the setup of a connection between two partners, e.g. station and control center. Costs are based on the amount of data transferred and not on the duration of the connection. For applications such as SINAUT ST7, this service is best used in combination with a dedicated line, since data can be sent as soon as they are generated. Failure of partners can also be quickly detected by means of these "dedicated lines". For applications such as remote maintenance, a dedicated line is setup for the duration of maintenance. In this case as well, the tariff based on volume usually results in lower costs.

The maximum data transmission speed with GPRS is 54 Kbit/s.

When the GPRS service is used, the control center or service center must be permanently reachable from the GPRS network, for example connected over a dedicated line to the GPRS provider or over a permanent connection to the Internet, for example using DSL. A direct GPRS connection from GPRS modem to GPRS modem is usually not possible or is offered by the GPRS provider as additional service subject to charge. With SINAUT, cross communication between two stations that communicate by means of GPRS is also possible without additional service: via the control center where the corresponding routing functions are offered. With SINAUT MICRO this function is included in the connection manager of the MICRO SC software. With SINAUT ST7, routing is implemented over a TIM module in the control center.