Data Sheet for Product

Siemens Industry, Inc. Page 5 of 8
Modbus Driver on the PXC Series Platform
Functionality
Notes on System Architecture
The Modbus Driver as RTU Master, Modbus TCP Client, and Modbus RTU over
Ethernet on Firmware Revision 2.
x (Figure 4), supports the following:
● Three physical FLNs (FLN 1 through FLN 3) on PXC Modular hardware can be
used for connecting and addressing either Modbus RTU or P1 devices on RS-485
FLNs.
● Up to two physical FLNs (FLN 1 through FLN 2) on PXC-36 hardware, depending
on ALN chosen, can be used for connecting and addressing either Modbus RTU
or P1 devices on RS-485 FLNs.
● Up to 95 virtual FLNs (6 through 100) for mapping devices through an Ethernet
TCP/IP network.
● Up to 95 virtual FLNs (6 through 100) for mapping devices accessed through
Modbus RTU over Ethernet. Diagnostic Point 50 identifies which FLNs are used
for RTU communication (at and below the set value) and which FLNs are used for
TCP communication (above the set value).
● Up to 247 device addresses per FLN.
● TX-I/O Modules.
● Maximum of 8,000 APOGEE points per driver.
Figure 5: System Architecture—Modbus RTU Master, Modbus TCP Client, and Modbus RTU over Ethernet
on Firmware Revision 3.x.