Chapter 3 Wiring - Mitsubishi 2404f User Manual

2408 f & 2404 f PROFIBUS Communications Handbook

CHAPTER 3 WIRING

RS485 is the transmission technology used in 2404 f and 2408 f PROFIBUS-DP controllers.
Connections are made to the rear terminal block as follows:
Controller Terminal Designation
HB Shield
HC VP
B/B
HD
HE A/A
HF D Gnd
Earthing the shield
The PROFIBUS standard suggests that both ends of the transmission line be connected to safety earth. If such a course is
followed, care must be taken to ensure that differences in local earth potential do not allow circulating currents to flow, as
these can not only induce large common mode signals in the data lines, but can also produce potentially dangerous heating in
the cable. Where doubt exists, it is recommended that the shield be earthed at only one section of the network.
Do not connect the shield to DGND.
A
Twisted
pair
A
Twisted
pair
A
Last station only requires
terminating resistors
C S
ABLE PECIFICATIONS
2408 f and 2404 f PROFIBUS Communications Handbook
Function
RF Ground for cable shielding
5 Volts for termination network only
RXD/TXD positive
RXD/TXD negative
0 Volts for termination network only
HA
B
SHIELD
HB
HC
HD
HE
HF
B
Intermediate stations
HA
B
HB
HC
390
HD
220
HE
390
HF
Figure 3-1: Connection Diagram for up to 32 Slaves.
Station 1
Not connected
Shield
VP (+5Vdc Voltage Potential)
B (Rx/Tx +ve)
A (Rx/Tx -ve)
DGND (Digital ground)
2408 f or 2404 f controller
Last Station
Not connected
Shield
VP (+5Vdc Voltage Potential)
B (Rx/Tx +ve)
A (Rx/Tx -ve)
DGND (Digital ground)
2408 f or 2404 f controller
Wiring
3-1