MLD-S Tech-FB Library Description - Bosch Rexroth

1-44 MLD-S Technology Library Rexroth MLD-S Tech-FB Library
1.9 Adjustment Function Blocks
Introduction and Overview
Basic Principle
⎡ Degree⎤
AlterationVelocity
⎢ ⎥
= Increments
⎣ s ⎦
With the function blocks:
• MX_ContinuousAdjustType01
• MX_ContinuousAdjustType02
• MX_IncrementalAdjustType01
PLC-Variables can be changed (jogged) continuously or incrementally via
binary inputs.
• The operation must be stopped via a binary input (Enable).
• The selected variable can be changed continuously with the function
blocks MX_ContinuousAdjustType01 or MX_ContinuousAdjustType02
(similar to long jog in SYNAX).
• The affected variable can be changed incrementally with the function
MX_IncrementalAdjustType01 (similar to short jog in SYNAX).
• The selected variable can be incremented and decremented within the
limit values.
• When reaching a limit value (HighLimitAck= TRUE or LowLimitAck=
TRUE), the continuous adjustment deactivates, i.e. the function block
no longer adjusts the variable. In this case, the corresponding limit
value, secified with the „HighLimit“ and „LowLimit“ inputs, is output.
• When the limits, „HighLimit“ and „LowLimit“, have the same value as
the specified modulo value, „LowLimit“ is set to zero and „HighLimit“ is
set equal to the modulo value. Thus adjusting is possible over the full
modulo value range.
The alteration velocity characterizes the rate of change of the adjusted
variable. The rate of change depends on the increments and the number
of increments per second. When changing a position, the alteration
velocity is calculated by:
1
⎢
⎣s
⎡ ⎤
[ Degree] * Increments per Second
⎥ ⎦
If, for example, the revolution speed of the virtual master axis is altered,
the alteration velocity is calculated by:
⎡r.
p.
m.
⎤
AlterationVelocity
⎢ ⎥
= Increments
⎣ s ⎦
1
⎢
⎣s
⎡ ⎤
[ r.
p.
m.
]*
Increments per Second
⎥ ⎦
Adjustment Limits
Basic Rules
While the adjustment signal is active, the influenced variable is adjusted
with the defined velocity.
The adjustment can only occur via the corresponding inputs if they are
within the specified limits.
Exception: If the start value of the influenced variable is outside the
specified limits, the influenced variable can only be modified in the
direction of the valid range. If a modulo value is specified, the influenced
variable can be modified in both directions. After reaching the valid range,
it is impossible to move the variable outside this range.
• When both adjustment signals (Inc/Dec) = TRUE simultaneously, both
signals are evaluated as FALSE.
• An adjustment signal with that changes polarity causes an immediate
inversion of the direction. Also, the current adjustment is not finished.
DOK-MLD-S*-TechFB*****-AW01-EN-D