The Profibus-Dp Network Interface Unit; Features - GE VersaPoint IC220PBI002 User Manual

2

The Profibus-DP Network Interface Unit

The VersaPoint ™ Profibus-DP Network Interface Unit (NIU), IC220PBI002, is the
link between Profibus-DP and the VersaPoint station. This module is an enhanced
version of the earlier Profibus-DP Network Interface Unit module IC220PBI001,
which it replaces. Differences between the two versions are explained below.

Features

The Profibus-DP Network Interface Unit has the following properties:
– A maximum of 63 VersaPoint I/O modules can be connected to Profibus DP
by simply plugging them in side by side next to the NIU. The NIU and the
VersaPoint modules create a station. Check chapter 5 to verify power
consumption.
– The sum of all input and output data can be up to 176 bytes per station for
module IC220PBI002 with its DIP switch 8 in the ON position. The maximum
is 184 bytes per station with DIP switch 8 in the OFF position. The maximum
for module IC220PBI001 is 184 bytes.
– The NIU can be used at a baud rate of 9.6 kbps for Profibus DP with a
maximum total expansion of 1200m (3937ft) or at baud rate of 12mbps with a
maximum of 100m (328 ft). The NIU automatically adjusts to the speed
specified by the Profibus master.
– Model IC220PBI002 also provides:
– DP/V1for Class 1 and Class 2 masters.
– Acyclic communications with modules such as RS-232 modules in the
process data channel.
– Fail-safe values
– Acknowledgement of I/O errors from the user program.
– Adaptation of the high byte/low byte format in 16-channel input and output
modules.
2-4 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005 GFK-1911B