CHAPTER 4: FIELDBUS INTERFACE
PROFIBUS DP
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
4–3
Profibus DP
To enable the Profibus physical interface, ensure that switches 3 and 4 of the DIP switch on
the communications card (on the CPU module) are ON, and that switches 1 and 2 are OFF.
The external connections through the Fieldbus interface are as follows:
Table 4-1: Fieldbus interface external connections (Profibus)
Table 4-2: DB9 signal pin applicability to MM300
Pin
Connection (external device)
V–
Pin 5
L
Pin 8, line A (negative TX/RX)
C
Common drain
H
Pin 3, line B (positive TX/RX)
V+
Pin 6
DB9 pin (external device) MM300 pin
Signal
Description
1
C
(shield)
Shield or potential equalization
2
No connection
M24
Ground of 24V power supply
3
H
RxD/TxD-P
Receive/Transmit data; line B (red)
4
No connection
CNTR-P
Repeater control
5
V-
DGND
Data ground (reference voltage to VP)
1
6
V+
VP
Power supply*
