Delta RMC101 - Manual (Page 459)

PROFIBUS-DP 5.4
Communications 5-209
Compact Mode keeps the number of words sent over the PROFIBUS to a minimum. This is
desirable to keep network traffic down and more importantly to keep the number of registers
required in the PLC or PC to a minimum. Compact mode requires only two words in and out per
axis, plus, optionally, one additional synchronization word in and out.
Note: Compact Mode without Sync requires RMC CPU firmware dated 19990916 or later (or
RMC beta firmware dated 19990727B or later) and GSD file (DELT1630.GSD) version 1.3 or
newer.
Message Mode is intended for systems that can support a large amount of data being sent over
the PROFIBUS and in which the master computer can have 96 input words and 64 output words
reserved for every RMC module. If the system can support these requirements, the Message
Mode gives constant access to up to 32 words of status information, and can write up to 59 words
or read up to 63 words with a single command.
For more information on these two commands, select one of the following topics:
Note: Message Mode requires RMC CPU firmware dated 19990625 or later (or RMC beta
firmware dated 19990412B or later) and GSD file (DELT1630.GSD) version 1.2 or newer.
• Using the PROFIBUS-DP Compact Mode
• Using the PROFIBUS-DP Message Mode
PROFIBUS-DP Configuration
There is very little to be done to configure the RMC to communicate on the PROFIBUS network.
In fact, the only thing to do is set the Station Address. However, you must also add the RMC as a
device to the master’s configuration. This is more difficult to do and the exact steps vary for each
master. Refer to PROFIBUS Configuration for instructions on setting the Station Address and
guidelines for adding the RMC as a device to the network configuration.
5.4.2 PROFIBUS Configuration
The following steps are required to connect an RMC unit to a PROFIBUS network. Each is
described below:
• Set the RMC’s Station Address
The RMC requires a station address to be selected.
• Determine the Appropriate GSD Configuration Module
The RMC’s GSD file has a number of configuration modules; only one may be selected.
However, it is vital that the correct configuration module be selected for a given RMC unit.
• Configure the PROFIBUS Network
The master device requires knowledge of all slave devices on the network and the configuration
of each slave device.
Setting the RMC’s Station Address
The steps above set the station addresses as expected by the master; this step sets the station
address that the RMC unit actually responds to. Both must be set to the same value for the same
unit. The RMC100 can use any station address between 0 and 126; the address is saved in the