Data Sheet for Product

Siemens Industry, Inc. Page 3 of 6
Modbus 250 Driver on the PXC Series Platform
Functionality
● Three physical FLNs (FLN 1 through FLN 3) on PXC Modular hardware, which
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 the ALN chosen, which can be used for connecting and addressing either
Modbus RTU or P1 devices on RS-485 FLNs.
● With Firmware 3.5 and later, one physical FLN (1) on the BACnet/IP PXC-24 and
PXC-16 hardware can be used for connecting and addressing Modbus RTU or P1
devices on RS-485 FLNs. In addition, the Ethernet port can be used for Modbus
TCP or Modbus RTU over IP.
● Up to 247 device addresses per FLN.
● TX-I/O Modules.
● Maximum of 8,000 APOGEE points per driver.
● Maximum of 250 Modbus points per driver.
Figure 3: System Architecture—Modbus RTU Master, Modbus TCP Client, and Modbus RTU over Ethernet
on Firmware Revision 2.x.
Notes on System Architecture
The Modbus 250 Driver as RTU Master, Modbus TCP Client, and Modbus RTU over
Ethernet on Firmware Revision 2.
x (Figure 3) 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.