Section 1 Introduction
Profibus Communications
The Brooks SLAMf is now equipped to support the Profibus communication
protocol. Profibus is a fieldbus-based automation standard of Profibus and
Profinet International (PI). Via a single bus cable, Profibus links controller or
control systems with decentralized field devices (sensors and actuators) on
the field level and also enables consistent data exchange with higher ranking
communication systems. Profibus digital signal connects externally through
an M12 connector (Figure 1-5), power via PG11/Conduit (also VOR Analog
Signal).
The communication electronics allows for automatic baud rate detection rang-
ing from 9600 baud to 12 Mbaud, thus making the need for any hardware
baud rate selection methods not required. For selecting the device address,
which must be unique on the network, two rotary switches are provided. This
allows a user to easily select any address number ranging from 0 to 126. This
can provide fast device replacement without complex network configurations.
The Profibus-DP piggyback board is equipped with a zero command pushbut
-
ton, allowing the user to give a manual command to the device to (re)balance
the flow sensor electronics. This command can also be issued through the
protocol.
The Profibus-DP communication option supports the following message types:
• Cyclic data exchange (Write/Read data).
• Read inputs (e.g. status, flow, temperature, totalizer, etc.).
• Read outputs (e.g. commands, setpoint).
• Global control commands (e.g. fail safe, sync).
• Get configuration (i.e. read number of I/O bytes and composition).
• Read diagnostics information (i.e. get error and alarm status).
• Set parameters (i.e. select gas number, engineering units, I/O configuration
• Set parameters (i.e. select gas number, engineering units, I/O
configuration etc.).
• Check configuration (i.e. check I/O composition).
For external connection see Profibus connections on Figure 1-5.
Figure 1-5 SLAMf Series Profibus Terminal Connections
Note: Aux Input is used for Remote Trans-
ducer Pressure Controllers only.
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