Omron CJ1W-PRT21 Operation Manual page 44

1 Features and System Configuration
Active stations
Master devices
Passive stations
Slave devices
The three masters form a logical token ring. When an active device receives the token message, it
can perform its master role for a certain period of time. During this time it can communicate with all
assigned slave devices in a master- slave communication relationship, and a DPM2 master can take
the initiative to communicate with DPM1 master devices in a master-master communication relation-
ship.
 Multi-peer Communication
In addition to logical peer-to-peer data transmission, PROFIBUS-DP provides multi-peer communi-
cation (broadcast and multicast).
 Broadcast Communication
An active station sends an unacknowledged message to all other stations (masters and slaves).
 Multicast Communication
An active station sends an unacknowledged message to a predetermined group of stations (masters
and slaves).
1-6
Token Passing
DPM1 DPM2
Polling
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
DPM1
PROFIBUS