Manual VIPA TM-E
Chapter 2
Hardware description
HB39E - TME - RE_900-1E630 - Rev. 09/11
2-5
The TM-E module is connected to your PLC CPU via the MPI interface.
The interface is designed as RS485 plug. There is a gender changer in the
scope of delivery. This converts the RS485 plug 1:1 to a RS485 jack.
To connect a plug designed as jack you may remove the gender changer.
The MPI interface has the following assignment:
9-pole SubD:
Pin
Assignment
1 n.c.
2 n.c.
3
RxD/TxD (line B)
4 n.c.
5 GND
6 n.c.
7 n.c.
8
RxD/TxD (line A)
1
2
3
4
5
6
7
8
9
9 n.c.
The serial line is to be terminated with its ripple resistor. Please make sure
to terminate the last participants on the bus at both ends by activating the
terminating resistor of 120
Ω
.
If there is no data activity, the bus gets external disturbances. To avoid
this a
line polarization
may be activated. Here the lines are held on a
constant level by connecting a pair of resistors of 680
Ω
.
At the left-side of the TM-E module there is a DIP switch. Here
line
polarization
and
termination
may be activated or deactivated.
The following switch positions are possible:
Position
Polarization
Termination
OFF
ON
4 3 2 1
off off
OFF
ON
4 3 2 1
on on
MPI interface
DIP switch for MPI
