Function
2-2
Robostar Co., Ltd
2.2
Profibus-DP Communication Specifications
Table 2.2 shows Profibus-DP communication specifications.
Specifications
Communication Speed
12M/6M/3M/1.5M/500k/187.5k/93.75k/45.45k/19.2k/9.6kbs
Communication Method
RS485-based half-duplex communication
Synchronous Method
Frame synchronous method
Encoding Method
NRZI(Non-Return to Zero, Inverted)
Channel Format
Bus format
Number of Units Accessed
32 per segment without repeater;
Up to 124 with repeater present
Data Transfer
Max 46byte input and 46byte output per slave
Slave Address
3~125 (generally no. 1, 2 used by master)
Connection Cable
Shielded twisted pair cable
Terminating Resistance
Table 2.2 Communication Specifications
2.3
Profibus-DP Address Map
Table 2.3 shows the Profibus-DP address map.
Address
Description
0
Service-, diagnosis-and programming tool
1..
2
Master(class1)
3..125
Slave(total
123
or 124)
126
Used for setting the slave address via software
127
Used when Master transmits data to all units (Broadcast Address)
Table 2.3 Profibus Address map