Modbus installation (RS485)
All PROFIBUS cord sets and connectors can be used for the Modbus wiring.
Distances
The bus cable is specified in EN 50170. This yields the following lengths for a bus segment.
|
Baud-Rate in kBits/sec |
9.6 |
19.2 |
38.4 |
|
distance in m |
1200 |
1200 |
1200 |
Bus segments
A bus segment consists of at most 32 devices. 69 devices are permitted in a Modbus network. Repeaters are required to refresh the signal in order to achieve this number. PROFIBUS repeaters can be sued. Each repeater is counted as one device.
IP-Link
IP-Link is the sub system of the modular Fieldbus Box system. The topology is a ring structure with an P-Link Master IP230x-B730. A maximum of 120 extension boxes can be connected to one IP-Link Master (coupler box). The distance between two IP-Link boxes can be 15m maximum. Check the IP-Link installation for more information.