Delta MMC120 - Manual (Page 97)

MMC120 Linear Motion Control Module Appendix B: Event Control
Delta Computer Systems, Inc 360/254-8688 97
Linking Steps
Link Next
Link Next is the number of the Step to be executed in the sequence as soon as the conditions specified by Link
Type and Link Value are met. Its range is 0 to 255.
Link Type and Link Value
Link Type and Link Value specify the condition which causes the MMC120 to execute the next Step in a
sequence. There are two link types: Basic and Enhanced. The Basic Link Types issue commands to an axis
based on its own position, speed, or status. The Extended Link Types issue commands to an axis based on the
position, speed, or status of the other axis. The Basic link types are case-significant ASCII values, while the
Extended link types are specified with a hex number in which the bits specify the axis number and link type.
Basic Link Types
Link Type Description Link Value Range
0 (zero) End of chain None None
B Status bits set Bit pattern Any bits
b Status bits cleared Bit pattern Any bits
D Delay Time in milliseconds 0 to 65,535
L Programmable Limit switch
(Target Position set-point) Position in Position Units 0 to 65,535
l Actual position Position in Position Units 0 to 65,535
N Relative from Command
Position Position in Position Units 0 to 65,535
n Relative from Actual Position Position in Position Units 0 to 65,535
R Target Position relative from
Start Position in Position Units 0 to 65,535
r Actual Position relative from
Start Position in Position Units 0 to 65,535
S Target Speed Speed in Position Units per
second 0 to 65,535
s Actual Speed Speed in Position Units per
second 0 to 65,535
Link Type 0 (zero) - End of sequence
When this Link Type is encountered the sequence of steps is terminated. No additional steps are executed
unless they are started as a new sequence.
Link Type B - Status bit on
This Link Type causes the MMC120 to execute the next Step in the sequence as soon as one of the selected
status bits is set to 1. The Link Value for Link Type B is a bit pattern expressed in hexadecimal. For example,
bit pattern 0000 0000 0001 0000 binary is 0010 hex, and specifies bit 12 (State Bit A, indicating acceleration).
If this bit is set the next Step will execute.