WAGO 750-341, Manual

Page: 139 / 246

Fieldbus Communication • 133
MODBUS Functions
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
... 25340 ... 0x62FC ... %QW1020 Additional 764 Words physical output data
25341
... 28671 0x62FD
... 0x6FFF - Modbus Exception: “
Illegal data address”
28672
... 29436 0x7000
... 0x72FC %QW256
... %QW1020 Physical Output Area (2)
Additional 764 Words physical output data
29437
... 65535 0x72FD
... 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").
Bit Access Reading (with FC1 and FC2):
Modbus-Address
[dec] [hex]
Memory Range Description
0
... 511 0x0000
... 0x01FF Physical Input Area (1)
First 512 digital inputs
512
... 1023 0x0200
... 0x03FF Physical Output Area (1) First 512 digital outputs
1024
... 12287 0x0400
... 0x2FFF - Modbus Exception:
“Illegal data address”
12288
... 13815 0x3000
... 0x35F7 Physical Input Area (2) Starts with the 513
th
and ends with
the 2039
th
digital input
13816
... 16383 0x35F8
... 0x3FFF Modbus Exception:
“Illegal data address”
16384
... 17911 0x4000
... 0x45F7 Physical Output Area (2) Starts with the 513
th
and ends with
the 2039
th
digital output
17912
... 65535 0x45F8
... 0xFFFF Modbus Exception:
“Illegal data address”
Bit Access Writing (with FC5 and FC15):
Modbus-Address
[dec] [hex]
Memory Range Description
0
... 511 0x0000
... 0x01FF Physical Output Area (1)
First 512 digital outputs
512
... 1023 0x0200
... 0x03FF Physical Output Area (1) First 512 digital outputs
1024
... 12287 0x0400
... 0x2FFF - Modbus Exception:
“Illegal data address”
12288
... 13815 0x3000
... 0x35F7 Physical Output Area (2) Starts with the 513
th
and ends with
the 2039
th
digital output
13816
... 16383 0x35F8
... 0x3FFF Modbus Exception:
“Illegal data address”
16384
... 17911 0x4000
... 0x45F7 Physical Output Area (2) Starts with the 513
th
and ends with
the 2039
th
digital output