22
PW20i
HBM
A1269-2.0 en/de/fr
ATTENTION
The PW20i CANbus driver relates to GND. The Master CANbus driver
must also relate to this GND.
A shielded cable must be used as the bus cable. The shield should
always be connected to the housing at both ends. The shield of the
PW20i cable is electrically connected with the PW20i housing (see Pin
assignments, PW20i).
Baud rate and bus cable lengths
The table below gives the maximum cable lengths for the DeviceNet bus,
subject to the baud rate:
Baud rate [kBit/s]
125
250
500
Max. cable length [m]
500
250
100
The max. cable length is the total line length, calculated from the length of all
the spur lines per node (bus nodes) and the line length between the nodes.
The length of the spur lines per node is limited and depends on the baud rate
being used (see secondary DeviceNet documentation: DeviceNet Specification
Volume 1, Appendix B, cable profiles). Should it be necessary, a separate
cable can be used to establish potential equalization between the PW20i and
the (PC/PLC) master (earthing concept). Cable shielding must not be used for
this potential equalization.
Setting the address
The address is set via the bus:
DeviceNet: 1...63 (default on delivery: 63)
Setting the bit rate
The bit rate is set with the field bus configuration tool via the bus; the factory
default is 125 Kbits
Explanations for DeviceNet communication can be found in the help file,
description of DeviceNet communication.
