Endress+Hauser Proline Promag L 400 - Page 39

Proline Promag L 400 Electrical connection
Endress+Hauser 39
PROFIBUS DP
The address must always be configured for a PROFIBUS DP/PA device. The valid address
range is between 1 and 126. In a PROFIBUS DP/PA network, each address can only be
assigned once. If an address is not configured correctly, the device is not recognized by the
master. All measuring devices are delivered from the factory with the device address 126 and
with the software addressing method.
Setting the address
1
2
3
4
1
2
3
4
1
2
ON OFF
Not used
Write protection
SW
64
32
16
8
4
2
1
PROFIBUS
address
A0023061
 15 Addressing using DIP switches on the I/O electronics module
1. Disable software addressing (OFF) via the top DIP switch 4 (SW).
2. Set the desired device address via the corresponding DIP switches.
 Example (→  15,  39): 1 + 16 + 32 = device address 49
The device demands rebooting after 10 s. After rebooting, hardware addressing is
enabled with the configured IP address.
7.3.2 Enabling the terminating resistor
PROFIBUS DP
To avoid incorrect communication transmission caused by impedance mismatch, terminate
the PROFIBUS DP cable correctly at the start and end of the bus segment.
• If the device is operated with a baud rate of 1.5 MBaud and under:
For the last transmitter on the bus, terminate via DIP switch 2 (bus termination) and DIP
switch 1 and 3 (bus polarization). Setting: ON – ON – ON (→  16,  40).
• For baud rates > 1.5 MBaud:
Due to the capacitance load of the user and the line reflections generated as a result, ensure
that an external bus terminator is used.
It is generally advisable to use an external bus terminator as the entire segment can fail
if a device that is terminated internally is defective.