Danfoss FCM 300 Series User Manual

FCM 300 Series
MG.03.B6.02 - VLT is a registered Danfoss trademark76
VLT address (ADR)
Two different address formats are used:
1. Siemens USS protocol address format:
76543210
00
00
0
Bit 7 = 0
Bit 6 is not used
Bit 5 = 1: Broadcast, address bits (0-4) are not used
Bit 5 = 0: No Broadcast
Bits 0-4 = VLT address 1-31
2. Danfoss format:
76543210
11
11
1
Bit 7 = 1
Bits 0-6 = VLT address 1-127 (0 = Broadcast)
Data control byte (BCC)
The data control byte can best be explained by
means of an example: Before the first sign of the
telegram is received, BCC = 0.
76543210
BCC
00
00
0
00
00
0
00
00
0
00
00
0
00
00
0
00
00
0
00
00
0
00
00
0
After the first sign has been received:
BCC
NEW
= BCC
OLD
EXOR "first byte"
(EXOR = exclusive-or gate)
BCC
OLD
= 0 0 0 0 0 0 0 0
EXOR
"first byte" = 0 0 0 0 0 0 1 0 (02H)
BCC
NEW
= 0 0 0 0 0 0 1 0
Each additional, subsequent byte is gated by
BCC
OLD
EXOR and gives a new BCC
NEW
, e.g.:
BCC
OLD
= 0 0 0 0 0 0 1 0
EXOR
"second byte" = 1 1 0 1 0 1 1 0 (D6H)
BCC
NEW
= 1 1 0 1 0 1 0 0
The result after the last received sign is BCC.
■ Databytes
The block of databytes is divided into two smaller
blocks:
1. Parameter bytes used for transferred parameters
between master and slave
2. Process bytes, covering
- Control word and reference value
(from master to slave)
- Status word and present output frequency
(from slave to master)
This structure applies to both the control telegram
(master→slave) and the reply telegram (slave→master).
Parameter bytes Process bytes
PKE IND PWE
HIGH
PWE
LOW
PCD1 PCD2
00 00 00 00 00 00 00 00 00 00 00 00
There are two types of telegrams:
- with 12 bytes built up as shown above, with
parameter and process block
- with four bytes, which is the process block from
the 12 byte telegram
1. Parameter bytes
1514131211109876543210
Commands and replies (AK)
Bits no. 12-15 are used for transmitting commands
from master to slave and the slave's processed reply
back to the master.
PNU
PKE
AK
Commands
and replies
Parameter
number
Not in use
IND PWE
HIGH
PWE
LOW
Serial communication

Danfoss FCM 300 Series Specifications

General

Brand	Danfoss
Model	FCM 300 Series
Category	Media Converter
Language	English