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Serial Communication for FC Protocol
MASTER
Protocols
All VLT 6000 drives have an RS-485 port which allows controlling the
drive by one of three different serial communication protocols. The
three protocols, which can be selected in parameter 500, Protocol,
are:
Johnson Controls Metasys N2
G
®
Siemens FLN
G
Danfoss FC protocol
G
Metasys N2 is a registered trademark of Johnson Controls.
FLN is a registered trademark of Siemens.
If Danfoss FC protocol is to be selected, set parameter 500, Protocol to
FC protocol .
For further information on operating the drive through N2 or FLN
communication, request the N2 or FLN Operator's Manual from
Danfoss Graham.
70
ADDRESS 1
ADDRESS 2
®
ADDRESS 31
REPEATER
ADDRESS 126
Packet Communication
Control and Reply Packets
The packet communication in a master/slave system is controlled by the
master. The drives are the slaves. A maximum of 31 VLT 6000 drives
can be connected to one master unless a repeater is used. If a
repeater is used, a maximum of 126 drives can be connected to one
master.
The master continuously sends packets addressed to the slaves and
awaits reply packets from them. The response time of the slaves is a
maximum of 50 ms.
Only a slave that has received a faultless packet addressed to that
slave will respond by sending a reply packet.
Broadcast
When a master sends a packet to all slaves connected to the bus at the
same time, it is called a broadcast. In broadcast communication, if the
packet has been correctly received, the slaves do not send reply
packets to the master.
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