Safety Integrated - Industry - Siemens

Überwachung auf sicher red. Geschwindigkeit z.B.
Schutzbereich offen und Zustimmung betätigt
Monitoring for safely limited speed, e.g. protection zone open
and enable function active
With AREA_PROTECTED=0 and ENABLE_MOTION=1, the minimum
drive speed value is monitored. If this value is exceeded,
the block sets parameter ENABLE_AXIS =0.
FB300 must be called via the safety program using a time interrupt
OB. The actual position of these two calls is saved via
FD_RED_ROUGH_POS yielding a delta. This delta may not exceed
the value of MAX_ENC_INC_PER_TIME [Maximum Encoder
Increments Per Time] parameterized at the input.
The following formula shows how to calculate the value to be
assigned to MAX_ENC_INC_PER_TIME from the speed to be
monitored:
Signals / values required:
■ a = max. speed;
The SIMOTION controller can read out the max. speed
via the axis information entered in TypeOfAxis.SetPoint-
DriverInfo.DriveData.maxSpeed
■ b=Leadscrew pitch
The SIMOTION controller can read out the leadscrew
pitch via the axis information entered in LeadScrew.pitch-
Val
■ c=Gear ratio1
The SIMOTION controller can read out the gear ratio 1
via the axis information entered in TypeOfAxis.NumberOf-
DataSets.DataSet_(n).Gear.numfactor
■ d=Gear ratio2
The SIMOTION controller can read out the gear ratio 2
via the axis information entered TypeOfAxis.NumberOf-
DataSets.DataSet_(n).Gear.denfactor
■ Number of increments per revolution (incremental
encoder) The SIMOTION controller can read out the relevant
value via P408
■ Number of increments per revolution (absolute encoder)
The SIMOTION controller can read out the relevant value
via P423
■ Time interrupt (call interval of the function block "F_DRIVE"
in a time interrrupt OB) The SIMOTION controller can
read out the time interrupt via OB3X_EX_FREQ
Calculation:
The maximum speed is calculated as follows:
Vmax [mm/sec] = a x b x c / d / 60
The max. increments are calculated as follows:
Incmax [1/sec] = a x P408 (p423) / 60
The permissible increments are calculated as follows:
MAX_INC_PER_TIME = Incmax x (SLS / Vmax) x t / 1000
In addition, the block is notified about the maximum permissible
speed in degrees resp. mm/s via the input MAX_SPEED
[Maximum Speed]. This value is compared with the value set
for FD_SPEED_SIMO [From Drive SIMOTION], analogously to
the speed monitoring function using increments.
FD_SPEED_SIMO is the speed which is transferred by the
SIMOTION controller to the FB300.
This value is stored using a CRC which has to be connected to
FD_CRC_SIMO [From Drive CRC SIMOTION]. The CRC is defined
by the values FD_CRC_SIMO = "SIMOTION speed" and
FD_LIVE_SIGN = "sign of life".
The speed parameterized at MAX_SPEED is output by the output
block TD_SPEED [To Drive Speed]. This speed is, for example,
sent to the SIMOTION function block where it is monitored
simultaneously.
Function Example No. MC-FE-I-004-V11-EN 453
Ex. No.
4