RMC100 and RMCWin User Manual
5-42
• Throughout this technical note, references are made to RMCWin online help index entries. To
obtain the RMCWin software package, contact Delta Computer Systems web site
(www.deltacompsys.com).
5.1.6.10 Technical Brief: Using the RMC Discrete I/O Parallel Event
Mode
Abstract
The RMC-DI/O is capable of sophisticated motion control using small and inexpensive
Programmable Controllers with simple discrete I/O. An RMC with a DI/O communication interface
is capable of four discrete I/O interfaces: Command Mode, Input to Event Mode, Parallel Position
Mode, and Parallel Event Mode. Of these communication modes, Parallel Event mode is the best
fit when the motion can be pre-programmed using the RMC’s Event Control feature and parallel
inputs can be provided to the RMC—such as through a PLC or thumb-wheel switch.
This technical brief will compare the discrete I/O interfaces of the RMC100 series product-line,
describe implementing Parallel Event Mode, and finally provide a sample application using
Parallel Event Mode.
DI/O Communication Mode Comparison
The following chart lists the advantages and disadvantages of each communication mode. Each
word or phrase in bold print appears in RMCWin’s online help index.
Event Mode
Up to four axes may be
commanded at once
• PLC or thumb-wheel
switches may be used
• Allows use of Event
Control feature
Requires parallel inputs
• Returns only a Halted
Bit—indicating an error
has occurred—
Position Bit per axis
• Sequence must be pre-
programmed in Event
Control
Position
Mode
Any position can be
moved to in a single
PLC scan
• Any open loop drive can
be triggered in a single
PLC scan
• Multiple profiles can be
selected for any move
Requires a PLC
• Returns only a Halted
Bit—indicating an error
has occurred—
Position Bit per axis
• Issues only Go and
Open Loop commands
•
one axis per scan
• Is limited in number of
speed/acceleration
Mode
be issued
• Any status information
can be retrieved
Requires a PLC
• Requires 2 PLC scans
per command
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