Lenze EPL10200 - Page 24

System bus (CAN) with Ser vo PLC & Drive PLC
General information
2-14
l
PLC-Systembus EN 1.1
2.6.3 Reading a parameter (example)
Ta s k
Reading the heat sink temperature (C0061) of the controller with the node address 5 via parameter
channel 1.
Telegram to the controller:
Formula Info
Identifier = Basic identifier + node address
= 1536 + 5
= 1541
• Basic identifier fo r parameter channel 1 (output) = 1536
• Node address of the controller = 5
Command code = 40
hex
• Command “Read Request”
(Request to read a parameter from the controller)
Index = 24575 - Lenze code number
= 24575 - 61
= 24514
= 5F C2
hex
• Code = C0061 (heat sink t e mpera ture)
Subindex = 0 • Subcode = 0 (no subcode)
Data 1 ... 4 = 0 • Only read request
11 Bit 8-byte user data
I
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Command
Index
S
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D
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t
a
1
D
a
t
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2
D
a
t
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3
D
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4
I
d
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C
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code
Low-byte High-byte
S
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D
ata
1
D
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2
D
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3
D
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4
1541 40
hex
C2
hex
5F
hex
0 0 0 0 0
Identifier = 1541
L
Identifier = 1413
Read Request
(C0061 = ???)
Read Response
(C0061 = 43 ºC)
SDO 1 / Node-ID 5
Telegram from the controller (value of the requested parameter):
Formula Info
Identifier = Basic identifier + node address
= 1408 + 5
= 1413
• Basic identifier for parameter channel 1 (input) = 1408
• Node address of the controller = 5
Command code = 43
hex
• Command “Read Response”
(Response to the read request with the actual value)
Index = Index of the read request
Subindex = Subindex of the read request
Data 1 ... 4 = 43 x 10000
= 430000
= 00 06 8F B0
hex
• Assumption: The actual heat sink temperature of the controller is 43 ºC,
accordingly, the value of the parameter to be read = 43
• Fixed32 data format (4 fixed decimal places);
Multiply value by 10000
11 Bit 8-byte user data
I
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t
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Command
Index
S
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b
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d
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D
a
t
a
1
D
a
t
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2
D
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t
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3
D
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4
I
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ent
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C
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a
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code
Low-byte High-byte
S
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b
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D
ata
1
D
ata
2
D
ata
3
D
ata
4
1413 43
hex
C2
hex
5F
hex
0 B0
hex
8F
hex
06
hex
00
hex
(LSB) (MSB)
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