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Accessories
C.2 Modems
● MSC protocol
Proprietary protocol used for productive communication via TCP connections in OPC
mode. The MSC allows authentication of the communications partner and simple
encryption. The MSC protocol is supported by the following control center applications:
– TeleControl Server Basic (TCSB)
– SINAUT MICRO SC
● MSCsec protocol
Proprietary protocol used for productive communication via TCP connections in OPC
mode. In addition to the MSC protocol, it also allows authentication of the messages
using an HMAC with the help of a symmetrical encryption method (with pre-shared key).
The MSCsec protocol is supported by the following control center applications:
– TeleControl Server Basic (TCSB)
SIMATIC S7 systems that can be connected locally
The following SIMATIC S7 systems can be connected to the GSM network via the MD720:
● SIMATIC S7- 200 via SINAUT PPI modem cable (6NH9701-0AD)
● SIMATIC S7-1200 via CP 1243-8 IRC / TS Module RS232
● SIMATIC S7- 300 via Ethernet TIM module (using GPRS)
● SIMATIC S7- 400 via TIM 4R IE (using GPRS)
● SIMATIC S7-300/400 via classic or Ethernet TIM module (only using CSD)
For project-specific solutions for connecting a SIMATIC S7-300 to the GSM network, please
contact Siemens Industry Online Support. You will find an example of an application with the
corresponding documentation on the following Internet page:
27038105 (http://support.automation.siemens.com/WW/view/en/27038105)
Possible partners of the MD720
The MD720 can communicate with the following partners.
● Communications partners of the MD720 installed in an S7-200:
– PC with TeleControl Server Basic (TCSB)
– PC with SINAUT MICRO SC
– S7-200 with MD720 (inter-station communication)
The MD720 operates in OPC mode.
● Communications partners of the MD720 installed in an S7-300/400:
– Station with Ethernet TIM (e.g. central CPU or control system SINAUT ST7cc/ST7sc)
The MD720 operates in OPC mode.
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The messages are forwarded by TCSB or SINAUT MICRO SC in the master station.
Operating Instructions, 06/2015, C79000-G8976-C385-01
CP 1243-8 IRC
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