WAGO-I/O-SYSTEM 750
Fieldbus Communication 245
750-882 Media Redundancy ETHERNET Controller
Manual
1.5.0
Register Access Writing (with FC6, FC16, FC22 and FC23)
Table 125: Register access writing (with FC6, FC16, FC22 and FC23)
MODBUS address
IEC 61131
Memory range
[dec]
[hex]
address
0...255
0x0000...0x00FF
%QW0...%QW255
Physical output area (1)
First 256 words of physical output data
256...511
0x0100...0x01FF
%IW256...%IW511
PFC IN area
Volatile PFC input variables
512...767
0x0200...0x02FF
%QW0...%QW255
Physical output area (1)
First 256 words of physical output data
768...1023
0x0300...0x03FF
%IW256...%IW511
PFC IN area
Volatile PFC input variables
1024...4095 0x0400...0x0FFF
-
MODBUS exception:
“Illegal data address”
4096...12287 0x1000...0x2FFF
-
Configuration register ( see following
chapter „Configuration Functions“)
Not with FC22 and FC23!
12288...24575 0x3000...0x5FFF %MW0...%MW12287 NOVRAM
24 kB retain memory *)
*) In Target settings RETAIN on 0, flags on
MAX (24 kB)
24576...25340 0x6000...0x62FC %QW512...%QW1275 Physical output area (2)
Additional 764 words physical output data
25341...28671 0x62FD...0x6FFF
-
MODBUS exception:
“Illegal data address”
28672...29435 0x7000...0x72FB %QW512...%QW1275 Physical output area (2)
Additional 764 words physical output data
29436...32767 0x72FC...0x7FFF
-
MODBUS exception:
“Illegal data address”
32768...36863 0x8000...0x8FFF
-
NOVRAM
"8 kB retain memory *)
*) In Target settings RETAIN on 0, flags on
MAX (32 kB)
36864...65535 0x9000...0xFFFF
-
MODBUS exception:
“Illegal data address”
The digital MODBUS services (coil services) are bit accesses, with which only the
states of digital I/O modules can be determined or changed. Complex I/O
modules are not attainable with these services and so they are ignored. Because
of this the addressing of the digital channels begins again with 0, so that the
MODBUS address is always identical to the channel number, (i.e. the digital input
no. 47 has the MODBUS address "46").
