Siemens SITRANS F M TRANSMAG 2 - B.1 PROFIBUS Communication; Profibus Communication

SITRANS F M TRANSMAG 2
Operating Instructions, 11/2009, A5E00102775-07
91
Profibus Communication
B
B.1 PROFIBUS Communication
The following functions of the standard device (with 20 mA/HART interface) are not offered
in the PROFIBUS version (7ME5034-1xxxx) because they are covered indirectly by the
PROFIBUS function:
● Analog output (0/4 to 20mA)
● HART communication
● Digital output 2 (relay output)
Data transfer
The SITRANS F M Transmag 2 has a PROFIBUS-PA connection compliant with IEC 1158
(synchronous transmission) which transfers data at a fixed speed of 31.25 kBit/s. The min.
TSDR at startup is 11 bit times and can then be changed using the "Set_Prm" service. The
bus address has the value 126 in the as-delivered state and can be changed either with the
DP service "Set_Slave_Add" or on the local operating unit (menu 4.1.1).
Communication via PROFIBUS takes place with the EN50170 standard (PROFIBUS DP and
DP V1).
The data traffic and the data formats are described in the following sections.
DP services
The following DP services are supported as slaves for a class 1 master:
● Data_Exchange
● Rd_Inp
● Rd_Outp
● Set_Prm
● Chk_Cfg
● Slave_Diag
● Set_Slave_Add
● Global_Control
● Get_Cfg
DP V1 services
The following DP V1 services are supported as slaves for a class 2 master DP V1 services
supported as slaves:
● MSAC2_Initiate (Indication and Response)
● MSAC2_Abort (Request, Indication and Response)
● MSAC2_Read (Indication and Response)
● MSAC2_Write (Indication and Response)