Bender FTC470XMB, Operating Manual

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Programming examples mode 2
88 TGH1367en/06.2010
8.6 Control commands for use in the BMS Slave mode
For carrying out the control commands below, the FTC470XMB is not required to take over
the Master function.
The Modbus RTU Master instructs a random Master in a BMS network to start insulation fault
location in an EDS system. FTC470XMB is in Slave mode during the whole process:
The Modbus RTU Master sends an appropriate command to FTC470XMB
(function 16, output data):
Insulation fault location is being started and acknowledged (function 3, input data)
The Modbus RTU Master instructs a random Master in a BMS network to start insulation fault
location in an EDS system in POSITION mode. The value to be requested is available at chan-
nel 3 with BMS address 7. FTC470XMB is in the Slave mode during the whole process:
The Modbus RTU Master sends an appropriate command to FTC470XMB
(function 16, output data):
Insulation fault location in POSITION mode is being started and acknowledged (function 3,
input data)
In this example the „value“ results from linking High-Byte and Low-Byte (byte 7+8).
* The value of the whole „address“ is formed as follows:
"Address" = (BMS address x 100) + channel number.
As shown in the example above, the result of linking address = 7 and channel = 3 is 703.
703 = 2BF hex
Byte 7 = 002 decimal
Byte 8 = 191 decimal
Word 1 Word 2 Word 3 Word 4 Word 5
H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte
always
„0“
Consecutive
Modbus ID
No.
BMS address of
the addressed
device
BMS
channel
No.
always
„0“
BMS
com-
mand
always
„0“
BMS
data
type
BMS data value
0 18 1 0 0 115 0 3 0
Word 1 Word 2 Word 3 Word 4 Word 5
0 18 1 0 0 115 0 3 0
Word 1 Word 2 Word 3 Word 4 Word 5
H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte H-Byte L-Byte
always
„0“
Consecutive
Modbus ID
No.
BMS address of
the addressed
device
BMS
channel
No.
always
„0“
BMS
com-
mand
always
„0“
BMS
data
type
BMS data value
0 19 1 0 0 115 0 5 0
Word 1 Word 2 Word 3 Word 4 Word 5
0 19 1 0 0 115 0 5 *2 *191