Delta RMC101 - Manual (Page 292)

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.
Interface
Mode Advantages Disadvantages
Parallel
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—and an In
Position Bit per axis
• Sequence must be pre-
programmed in Event
Control
Parallel
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—and an In
Position Bit per axis
• Issues only Go and
Open Loop commands
• Gives commands to only
one axis per scan
• Is limited in number of
speed/acceleration
profiles
Command
Mode • Any RMC command can
be issued
• Any status information
can be retrieved
• Requires a PLC
• Requires 2 PLC scans
per command
• Gives commands to only