Description of Functions
9-72
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
In all operating modes except Control mode, the “servo ready” signal is required for
the duration of every traversing movement when the parameter is active (MD37.2).
If the servo ready is not detected or is deactivated during the movement, the
“servo not ready” message is triggered (see Table 11-5, Class 3/No. 62).
Optional signal “Boost” / “PWM”
The interface signal “Boost” or “PWM” (pulse width modulation) permits optimized
operation of the stepper drive using phase current control. The FM 353 implements
these two functions via an output. This is done by alternate machine data selec-
tion.
The active level of the signal can be parameterized.
Signal response:
Movement status Output signal
“Boost”
Output signal “PWM”
Idle inactive pulse duty factor per
MD 51
Acceleration/delay active static active
Constant travel inactive pulse duty factor per
MD 50
The following table shows you the available machine data for parameterizing the
function.
MD Designation Value/Meaning
37 Special control signals
37.16 Boost active 0:Boost function not used
1:Boost function used
Output signal
37.17 Boost inverted 0:Boost signal high active
1:Boost signal low active
37.18 PWM active 0:PWM function not used
1:PWM function used
37.19 PWM inverted 0:PWM pulse high active
1:PWM pulse low active
48 Boost duration absolute 1 − 1,000,000 ms
49 Boost duration relative 1 − 100%
50 Phase current travel Pulse duty factor [%]
51 Phase current idle
Function, PWM:
The signal is generated as a 20 kHz frequency.
Boost function:
The signal is monitored with reference to the maximum absolute and relative active
phase.
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