Memory Map; Memory Locations - GE P485 Instruction Manual

DATA EXCHANGE

MEMORY LOCATIONS

3–2
The PLC exchanges data
via the Profibus network
between its internal input
area and the input area
of the P485
Input data area
0x0000
The data in the input area of
the P485 contains data received
from nodes on the Modbus
sub-network (sent in to the P485
from the sub-network)
Modbus sub-network

Memory Map

When configuring the sub-network, use the memory locations shown below:
Address Contents
0x0000 to 0x0001 Status register
0x0002 to 0x00F3 Input data area
0x00F4 to 0x01FF Reserved
0x0200 to 0x0201 Control register
0x0202 to 0x02F3 Output data area
0x02F4 to 0x03FF Reserved
0x0400 to 0x7FF General data area
PLC memory
I/O inputs
I/O outputs
Current Ia CT PRIMARY
Profibus network
Internal memory buffer
of the P485
Output data area
0x0200
Current Ia CT PRIMARY
Modbus slave (e.g. PQMII)
CT PRIMARY setting
Current Ia actual value
Figure 3-2: Data exchange overview
Access
read/write
read/write
-
read only
read only
-
read/write
P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE
The PLC exchanges data
via the Profibus network
between its internal output
area and the output area
of the P485
General data area
0x0400
The data in the output area of
the P485 contains data received
from Profibus. In this case, it is
the CT PRIMARY setting of the
PQMII meter.