Data Sheet for Product

Page 6 of 8 Siemens Industry, Inc.
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 3.
x (Figure 5), supports the following:
● BACnet MS/TP or BACnet/IP ALN on Firmware 3.
x .
If the driver is on a BACnet MS/TP network, you can use a standard field panel
with Firmware Revision 3.1 or later as a router to connect to an Insight
workstation. Do not use an Integration Driver as the router.
● 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 6: System Architecture—Modbus Driver used as a Modbus TCP Server (Firmware 2.x).
Notes on System Architecture
The Modbus Driver in Modbus TCP Server Mode (Figure 6), with either Firmware 2. x
or 3.
x , supports the following:
● BACnet MS/TP or BACnet/IP ALN on Firmware 3.
x .
If the driver is on a BACnet MS/TP network, you can use a standard field panel
with Firmware Revision 3.1 or later as a router to connect to an Insight
workstation. Do not use an Integration Driver as the router.
● One virtual FLN (252).
● The driver can be configured to represent between 1 and 247 devices on the
Modbus communication link.
● Maximum of 8000 points per driver.
Modbus TCP Server mode is an exclusive mode of the Modbus Driver. No other
Modbus modes are available when the driver is in Modbus TCP Server mode.