ProSoft Technology 5204SE-MNET-PDPMV1 - Manual (Page 38)

5204SE-MNET-PDPMV1 ♦ ProLinx Gateway Procedures
Modbus TCP/IP to PROFIBUS DP-V1 Pass-Through Master User Manual
Page 38 of 235
ProSoft Technology, Inc.
December 22, 2009
3.4.3 Configure the MNET Server Settings (Optional)
All 4000 of the gateway's 16-bit internal memory registers can be read by remote
Modbus TCP/IP Clients. The gateway database registers can be read by remote
Modbus TCP/IP Clients (Masters) using virtual Modbus addresses 40001 through
44000 (for five-digit addressing) or 400001 through 404000 (for six digit
addressing).
However, not all 4000 registers can be written with Modbus TCP/IP write
requests from remote Clients. To maintain compatibility with the PROFIBUS DP-
V1 Master protocol on this gateway, the MNET Server accepts write requests
from Clients only if the register address and range (count) used in the command
will place data in the PROFIBUS Output data area. This is the gateway database
area that holds data which will be sent to Slaves on the PROFIBUS DP network.
The allowable range of Modbus TCP/IP addresses for acceptable write requests
is 41001 through 41768 (for five-digit addressing) or 401001 through 401768 (for
six-digit addressing). This address range is equivalent to the gateway's database
registers 1000 through 1767.
Care must be taken if remote Clients are allowed to write to this data area
because, once data values are written into those registers, those data values will
be passed to PROFIBUS slaves. Which slave or slaves receive the data will be
determined by the PROFIBUS Master/slave configuration.
The default values contained in MNET Servers section of PCB should work for
most applications and should not need to be modified. If you wish to view the
MNET Server settings, you may do so by expanding the MNet Servers section of
the gateway configuration tree.