Data Sheet for Product

Page 2 of 4 Siemens Industry, Inc.
Modbus Driver on the TC Series Platform
Functionality
Notes on System Architecture
The Modbus Driver as RTU Master, Modbus TCP Client, and Modbus RTU over
Ethernet (Figure 1) 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 a BACnet
workstation. Do not use an Integration Driver as the router.
● Three physical FLNs (FLN 1 through FLN 3) on TC Modular hardware can be
used for connecting and addressing Modbus RTU devices on RS-485 FLNs.
● Up to two physical FLNs (FLN 1 through FLN 2) on TC-36 hardware, depending
on ALN chosen, can be used for connecting and addressing Modbus RTU 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 TCP and/or 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.
● Up to 1000 points per drop/slave.
● Up to 100 different applications per driver.
● TX-I/O Modules.
● Maximum of 8,000 TALON points per driver.
Figure 2: System Architecture—Modbus Driver used as a Modbus TCP Server.
Notes on System Architecture
The Modbus Driver in Modbus TCP Server Mode (Figure 2) 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 a BACnet
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.