WAGO I/O SYSTEM 750 XTR
Modbus – CODESYS 2 295
750-8202/040-001 PFC200 2ETH RS TELE XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
9.4.3
Modbus Registers
WAGO specific registers are implemented in the last Modbus-relevant address
area; this simplifies the reading of certain system and Modbus information, as
well as configuration.
The Modbus address area reserved for these registers ranging from the Modbus
starting address of 4096 (0x1000) up to the Modbus end address of 12287
(0x2FFF), without any allocation to the IEC 61131 address area. These registers
can be queried using the register read services FC3, FC4 and FC23 and with the
register write services FC6, FC16 and FC23. A detailed description of the
individual registers is given in the section “WAGO Modbus Registers”.
9.4.4
Modbus Mapping
9.4.4.1 Modbus Mapping for Write Bit Services FC1, FC2
The table below outlines the mapping for the Modbus-reading, bit-oriented
services:
•
FC1 – Read Single Coil,
•
FC2 – Read Discrete Inputs.
Table 216: Modbus Mapping for Read Bit Services FC1, FC2
Modbus Address
(hexadecimal values
in parentheses)
IEC 61131
Address
Description
0 … 6143
(0x0000 … 0x17FF)
%IX1000.0 …
%IX1383.15
Modbus Output:
6144 PFC input bit variables in the first
384 registers/words (768 bytes) of the
2kB Modbus output process image in the
PII.
Note: In this area, the read bit services
return the content from the bit-addressed
PII.
6144 … 12287
(0x1800 … 0x2FFF)
%QX1000.0 …
%QX1383.15
Modbus Input:
6144 PFC output bit variables in the first
384 registers/words (768 bytes) of the 2
kB Modbus-input process image in the
PIO.
12288 … 65535
(0x3000 … 0xFFFF)
%MX0.0 …
%MX3327.15
Maximum bit-addressable flag area:
53248 bit flags (6.5 kB);
the actual addressable flag area
depends on the current memory
arrangement in CODESYS.
