Modbus process image, Bc7300 process image – BECKHOFF BC7300 User Manual
Page 22
MODBUS
22
BC7300
MODBUS Process Image
Terminals
Functions
Offset
Length
POS 1. Terminal 2 digital inputs
4, 23
0x0802
16 bit
2
0x0000
0x0001
1 bit
1 bit
POS 3. Terminal 2 digital outputs
3, 6, 16, 23
0x0002
16 bit
1, 5, 15
0x0000
0x0001
1 bit
1 bit
POS 5. Terminal 2 analog inputs
4, 23
0x0800
0x0801
16 bit
16 bit
POS 8. Terminal 2 analog outputs
3, 6, 16, 23
0x0000
0x0001
16 bit
16 bit
PLC variables 16 byte inputs
4, 23
0x0803
0x0804
0x0805
0x0806
0x0807
0x0808
0x0809
0x080A
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
MODBUS example
PLC variables 16 byte outputs
3, 6, 16, 23
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000A
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
16 bit
BC7300 Process Image
Byte address
Terminal
Inputs
Terminal
Outputs
0
Status
Control
1
-
-
2
Data 0
Data 0
3
Data 1
Data 1
4
Status
Control
5
-
-
6
Data 0
Data 0
7
KL3002 (POS 6)
Data 1
KL3002
(POS 6)
Data 1
8
Data 0
Control
9
Data 1
-
10
Data 0
Data 0
11
KL3002 (POS 7)
Data 1
Data 1
12
Status
Control
13
-
-
14
Data 0
Data 0
15
Data 1
KL4032
(POS 9)
Data 1
16
Status
Data 0
17
-
Data 1
18
Data 0
Data 0
19
KL4032 (POS 9)
Data 1
KL4032
(POS 10)
Data 1
20
Bit 0/1
Bit 0/1
21
KL1012 (POS 2)
-
KL2112
(POS 4)
-
Example for the BC7300
128..143 PLC Variables
PLC
Variables