Changing The Device Address; Writing Parameters - Pepperl+Fuchs MWC25M-L2M-B20 Series Manual

MWC25M-L2M-B20 series
Commissioning
6.2.2

Changing the Device Address

After switching on the sensor, it always initially starts with address 128. An "address claiming"
process begins with the network management of the J1939 network. An address is then
assigned to the sensor; this address is not stored persistently. This means that a new address
claiming process with start address 128 is carried out each time the system is restarted.
The PGN "Commanded Address" 0xFED8 is also supported. The parameterization tool or your
controller must support the J1939 "Broadcast Announcement Message" (BAM) transport pro-
tocol for this purpose. In this process, the sensor can be assigned a different address if a fixed
address should be specified for the sensor.
1.
Prepare the "Commanded Address Message" by typing the following entries in byte 1 - 8:
• Byte 1 - 7: J1939 NAME of sensor
• Byte 8: New address to be assigned to the sensor
2.
Send the prepared "Commanded Address Message" to global address 255.
There are 2 ways to process the message in the J1939 network:
Command is accepted: The sensor initiates "Address Claiming" to claim the new address.
Command is ignored: If the sensor cannot accept the new address, "Address Claiming" is
performed with the new address as the start address.
6.2.3

Writing Parameters

The sensor offers the PGN CAM11/CAM21 from the CiA510 specification for writing parame-
ters. These parameter groups are extensions of the J1939 protocol, which make it possible to
use classic CANopen services such as SDOs and emergency messages in J1939 networks.
The specification tunnels CANopen SDO messages via a PGN standardized by SAE.
Note
If the "Commanded Address" is in the "preferred" range and a "claim fail"
occurs, the sensor goes to address 254. The standard "Address Claiming"
process takes place in the "dynamic" area (Address +1).
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