WAGO 750-830 Manual page 64

64 • BACnet/IP Controller 750-830
Data Exchange
In addition, all output data is mirrored in the BACnet/IP controller to a mem-
ory area with the address offset 0x0200 and 0x1000. This makes it possible to
read back output values by adding 0x0200 and 0x1000 to the MODBUS ad-
dress. Other memory areas are also provided in the controller, some of which
cannot be accessed by the fieldbus side, however.
• Data memory (256 kByte)
• Program memory (512 kByte)
• NOVRAM remanent memory (24 kByte)
Note
The breakdown of the NOVRAM can be modified when required in the pro-
gramming software WAGO-I/O-PRO CAA/Register "Resources"/Dialog
window "Target system settings".
The start address for the flag area is fixed at 16#30000000. The area sizes and
the start address for the retain memory can be varied.
We do recommend keeping the standard settings, however, in order to avoid
any overlapping of the areas.
In these default settings the size of the flag area is set at 16#2000, followed
by the retain memory, with the start address 16#30002000 and the size
16#4000.
The data memory is a volatile RAM memory for creating variables that are
not required for communication with the interfaces, but rather for internal
processing procedures, such as calculation of results.
The IEC 61131-3 program is filed in the program memory. The code mem-
ory is a flash memory. Once the supply voltage is applied, the program is
transmitted from the flash to the RAM memory. After error-free run-up,
the PFC cycle starts with the mode selector switch at the top position, or
on the Start command from the WAGO-I/O-PRO CAA.
The remanent memory is a non-transitory memory, i.e. all values are re-
tained following a power failure. The memory management is automatic.
The 24 kByte memory area is normally divided into an 8 kByte address-
able range for flags (%MW0 ... %MW 4095) and a 16 kByte retain area for
variables without memory area addressing, or for variables that are explic-
itly defined by "var retain".
WAGO-I/O-SYSTEM 750
BACnet/IP Controller