Delta RMC151 - Manual (Page 512)

RMC70/150 and RMCTools User Manual
Required
(16-bit
words)
consistent**
I/O words
consistent**
I/O words
+
16
consistent**
Input words
of 16
consistent**
I/O words
16
consistent**
I/O words
+
16
consistent**
Input words
*For commands with more than 5 command parameters, only the first 5 parameters will
be issued. The remaining parameters will be 0. To issue such commands completely,
include them in a user program and issue a command via PROFIBUS to start the user
program.
**A block of PROFIBUS data is called 'consistent' if it is consistent over the length of the
block, rather than just over a single 8- or 16-bit data item. Consistent blocks of data
will stay together through the communication, from the time it was captured in the slave
device until it is delivered to the master application, whereas data from different
consistent blocks could have been sampled at different times.
For details on reading, writing and issuing commands, see the mode type you are using.
For instructions on how to select a mode, see the PROFIBUS Configuration topic.
RMC Register Addresses for Basic/Enhanced Modes
When using the Basic/Enhanced modes, the RMC register addresses use the same
file:element addresses as the RMC's Allen-Bradley IEC-61131 addresses.
For example, to read the Axis 0 Actual Position via PROFIBUS, its address is %MD8.8.
Therefore, the address via PROFIBUS is file 8, element 8.
6.9.5.2. PROFIBUS Mode: Basic
The Basic mode is one of the Basic/Enhanced PROFIBUS Modes available only on the RMC75P.
Most users will prefer the I/O Modes instead.
Features
This mode has the following features:
• Eight (8) user-selectable cyclic read registers are continuously read for instant access
by the PLC or PC.
See Response Block and Setting up the Indirect Data Map below.
• One (1) register anywhere in the RMC70 can be explicitly written or read.
See Read from the RMC70 and Write to the RMC70 below.
• Commands can be issued to any number of axes simultaneously.
See Command Block, Issue a Single Command and Issue Simultaneous
Commands below.
• PROFIBUS bandwidth used: 16 consistent I/O words (16-bits each)
RMC70 Register Addresses for PROFIBUS
When communicating over PROFIBUS, the RMC70 registers addresses use the same
file:element addresses as the RMC70 IEC-61131 addresses.
For example, to read the Axis 0 Actual Position via PROFIBUS, notice that its address is
%MD8.8. Therefore, the address via PROFIBUS is file 8, element 8.
Parameterization
Basic mode requires the PROFIBUS configuration and parameterization listed below. The
GSD file does direct the PROFIBUS master setup software to automatically set up these
492 Delta Computer Systems, Inc.