User Manual

6 Communication
6.9.5. Using Basic/Enhanced Modes (RMC75P Only)
6.9.5.1. Basic/Enhanced PROFIBUS Modes (RMC75P Only)
The RMC75P supports four additional modes that are not supported by the RMC150E: Basic,
Basic+, Enhanced, and Enhanced+.
These Basic/Enhanced modes require more programming in the PLC and are typically more
difficult to use than the I/O modes
. Therefore, most users will prefer the I/O modes. However,
the I/O modes typically require more programming in the RMC. The following table lists pros
and cons of the Basic/Enhanced modes to help you choose which mode is appropriate for your
application:
I/O Modes
Basic/Enhanced Modes
Advantages
• Easy to understand
• Requires little programming in the PLC.
• Can start user programs to issue
commands or read and write any
registers.
• Supported by both the RMC75P and
RMC150E. Therefore, programs made
for either RMC easily transfer to other
RMC.
Advantages
• Directly issue commands
• Directly write to any register(s)
• Directly read from any registers(s)
• Does not require using the Program
Triggers and User Programs
Disadvantages
• Requires using the Program Triggers
and/or user programs in the RMC.
Disadvantages
• Can be difficult to understand
• Requires a lot of programming in the
PLC.
• Not supported in the RMC150E.
Therefore, programs made for these
modes for the RMC75P do not directly
transfer to the RMC150E.
Basic/Enhanced Mode Details
If you decide to use a Basic/Enhanced mode, choose from one of the following. For more
details, see the topic for each respective mode.
Mode:
Basic
Basic+
Enhanced
Enhanced+
Commands*
per Cycle
1
1
1
1
Simultaneous
Commands
Cyclic Read
Registers
8
16
8
16
Explicit Read
Registers
1
1
1+7
1+7
Explicit Write
Registers
1
1
1+7
1+7
Bandwidth
16
16
2 blocks
2 blocks of
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