AutomationDirect DL205 User Manual

DL205 User Manual, 4th Edition, Rev. D
5-185
Chapter 5: Standard RLL Instructions
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D
Master Line Set (MLS)
The Master Line Set instruction allows the program to control sections
of ladder logic by forming a new power rail controlled by the main left
power rail. The main left rail is always master line 0. When an MLS
K1 instruction is used, a new power rail is created at level 1. Master
Line Sets and Master Line Resets can be used to nest power rails up to
seven levels deep. Note that unlike stages in RLL
PLUS
, the logic within
the master control relays is still scanned and updated even though it will not function if the
MLS is off.
Master Line Reset (MLR)
The Master Line Reset instruction marks the end of control for the
corresponding MLS instruction. The MLR reference is one less than
the corresponding MLS.
Understanding Master Control Relays
The Master Line Set (MLS) and Master Line Reset (MLR) instructions allow you to quickly
enable (or disable) sections of the RLL program. This provides program control flexibility.
The following example shows how the MLS and MLR instructions operate by creating a sub
power rail for control logic.




230
240
250-1
260
K aaa
MLS
Operand Data Type DL230 Range DL240 Range DL250-1 Range DL260 Range
aaa aaa aaa aaa
Constant K 1-7 1-7 1-7 1-7




230
240
250-1
260
K aaa
MLR
Operand Data Type DL230 Range DL240 Range DL250-1 Range DL260 Range
aaa aaa aaa aaa
Constant K 0-6 0-6 0-6 0-6
X0
X1
X2
OUT
Y7
X3
MLS
X10
K1
K2
K0
K1
MLS
OUT
MLR
MLR
OUT
Y10
Y11
DirectSOFT
When contact X0 is ON, logic under the first MLS
will be executed.
When contact X0 and X2 are ON, logic under the
second MLS will be executed.
The MLR instructions note the end of the Master
Control area.
DS Used
HPP Used

AutomationDirect DL205 Specifications

General

Brand	AutomationDirect
Model	DL205
Category	Controller
Language	English