BECKHOFF FM33xx - Manual (Page 14)

Functional description
FM33xx 9
Functional description
The interfaces
The module has manual and electrical interfaces. The electrical interfaces
connect the PROFIBUS cable to the termination resistor and the power
supply for the fieldbus connection. For the temperature measurement, the
thermocouples are wired via the 24 or 64 pin connection strips and the PE
connection. The module also has a serial interface for configuration. The
module's station address can be set via the manual interface. The LEDs of
the visual display supply information about the current status of the TC-
Plug module.
Round connector
The round 6-pin connectors are used to connect the PROFIBUS cables
and the module's operating voltage. The operating voltage is fed via the
module's 6-pin male connector. The operating voltage is brought out on the
6-pin female connector side to supply the next module. The supply voltage
for the PROFIBUS cables is also fed in at the plug side and brought out
again on the socket side. The internal 5V bus voltage is brought out on the
socket side in order to supply the termination resistor. This voltage must
not be used for other purposes, and must not be connected elsewhere
through the cables. The screw threads on the round connector are in
metallic contact with the module housing, and provide a low-resistance
connection for the PE line. Grounding the screening braid on the
PROFIBUS cable is therefore effective.
Status LEDs for the
PROFIBUS-
communication
Status LEDs for the
thermocouple input
channels
Serial configuration
interface and switches
for station addresses
6-pin plug and socket
for fieldbus connection
PE connection