Technical data

Technology functions
CPU 317T: Technology Functions
6-200 A5E00251798-03
6.5.2 FB 431 MC_CamSwitchTime - Time-based cam
Purpose
• At the "MC_CamSwitchTime" technology function, you enable / disable time-
based or switching cams, and define their switching characteristics. The time-
based cams are set when the ON position is reached, and are reset when the
pulse period has expired.
• In your cam configuration, you can define whether the switching positions are
based on setpoint or actual values.
• All specified times refer to the timebase configured in S7T Config.
• The current switching state of the cam is stored in the technology DB.
Applicable to
• Time-based cam
Overriding commands
An MC_CamSwitchTIME command can only be canceled by a further
MC_CamSwitchTime command to the same technology object. An
MC_CamSwitchTime command does not cancel any other commands.
Input parameters
Parameter Data type Start value Description
CamSwitch INT 0 Number of the technology DB
Execute BOOL FALSE Operating state transition at the positive edge
OnPosition REAL 0.0 Switch-on position
Duration REAL 0.0 Pulse width (physical unit according to the "Time" unit
set at the corresponding axis)
Hysteresis REAL 0.0 Hysteresis
Delay REAL 0.0 Time-based offset of the switching points (Derivative
time)
Value 0: Advanced switching
Value 0: Delayed switching
Mode INT 2 Operating mode:
Value = 1: Cam locked
Value = 2: Cam enabled (output not inverted)
Value = 3: Cam enabled (output inverted
Value = 4: Cam permanently enabled
Direction INT 1 Effective direction of the cam:
Value = 1: Effective direction positive
Value = 2: Effective direction positive and negative
(i.e. effective direction is irrelevant)
Value = 3: Effective direction negative
Value = 4: Use last effective cam direction