Siemens SIPROTEC 7SJ61 Technical Data

7SJ61/62/63 6MD63 - Modbus
C53000-L1840-C001-01
1-1
1 Bus specific parameters
Bus specific parameters
1
The following settings for the serial communication between the Modbus
master and the Modbus slave of the SIPROTEC device have to be
defined when programming the device using the parameterization
system DIGSI.
Slave address
Permissible slave addresses are in the range between 1 and 247.
Modbus mode
The Modbus slave of the SIPROTEC device supports the two serial
transmission modes ASCII and RTU:
• In ASCII mode each byte in a Modbus message is sent as two ASCII
characters. For error checking a Longitudinal Redundancy Check
(LRC) is used.
• When the Modbus slave is setup to communicate on a Modbus
network using RTU mode each byte in a Modbus message contains
two hexadecimal characters. In RTU mode a Cyclical Redundancy
Check (CRC) is applied for frame checking.
Baud rate
The following baud rates are available:
• 300, 600, 1200, 2400, 4800, 9600, 19200 Bit/s.
Parity
The parity is adjustably to:
• even or odd parity bit (EVEN, ODD) in ASCII mode,
• none, even or odd paritiy bit (NONE, EVEN, ODD) in RTU mode.
Maximum slave
response time
The maximum response time determines the time interval within which
the Modbus slave may respond to enquiries from the master.
This value is indicated into milliseconds unities and must be coordinated
with the time-out of the Modbus master.
The following formula is valid:
T
bus
< (T
max
+ T
bus
) < T
master
T
bus
- Transmission time of the slave response on the bus line,
T
master
- Time-out of the Modbus master,
T
max
- Maximum slave response time.

Siemens SIPROTEC 7SJ61 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ61
Category	Controller
Language	English