60 • Fieldbus Controller
Fieldbus Controller 750-872/020-000
WAGO-I/O-SYSTEM
750
ETHERNET TCP/IP
Overview of the IEC 61131-3 address ranges:
Address range
MODBUS
Access
SPS
Access
Description
phys. Inputs
read
read
Physical Inputs
(%IW0 ... %IW255 and
%IW512 ... %IW1275)
phys. Outputs
read/write
read/write Physical
Outputs
(%QW0 ... %QW255 and
%QW512 ... %QW1275)
MODBUS/TCP
PFC IN variables
read/write
read
Volatile SPS Input variables (%IW256 ... %IW511)
MODBUS/TCP
PFC OUT variables
read
read/write Volatile SPS Output variables (%QW256 ... %QW511)
Ethernet/IP
PFC IN variables
-
read
Volatile SPS Input variables (%IW1276 ... %IW1531)
Ethernet/IP
PFC OUT variables
-
read/write
Volatile SPS Output variables (%QW1276 ... %QW1531)
Configuration register
read/write
---
see Chapter „Ethernet“
Firmware register
read
---
see Chapter „Ethernet“
Flags/RETAIN
variables
read/write read/write
Remanent memory (%MW0 ... %MW12288)
Table 3.1.7: Overview IEC 61131-3 Address ranges
3.1.6.2.3 Absolute Addresses
Accessing individual memory cells (absolute addresses) in accordance with
IEC 61131-3 is made using special character defined in the table below:
Position
Character
Designation
Comments
1
%
Starts absolute address
2
I Input
Q Output
M Flag
3
X*
Single bit
Data width
B
Byte (8 Bits)
W
Word (16 Bits)
D
Double word (32 Bits)
4
Address
e. g. word wise: %QW27 (28. Word), bit wise: %IX1.9 (10. Bit in Word 2)
* The character ‘X’ for bits can be deleted
Table 3.1.8: Absolute Addresses
Note
Enter the absolute address character strings without blanks (white spaces)!