Siemens SIMATIC ET 200SP - Behavior of a DQ (Ssi_Absolute_Encoder)

Using the SSI_Absolute_Encoder technology object
4.4 Configuring SSI_Absolute_Encoder
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
147
4.4.5
Behavior of a DQ (SSI_Absolute_Encoder)
Operating mode
With the operating mode, you specify the reference value with which the comparison
functions work.
Operating mode
Meaning
Use position value (SSI absolute
value) as reference
(default)
The comparison functions and hardware interrupts for compare
events work with the position value.
Use measured value as reference
The comparison functions and hardware interrupts for compare
events work with the measured value.
Note
You configure the operating mode under "Behavior of DQ0" for both digital outputs together.
The operating mode is
also displayed under "Behavior of DQ1".
Set output
With the parameter assignment of a digital output, you specify the condition upon which the
digital output switches.
You can select from the following options depending on the operating mode:
Function of a digital output
(Page 48) in operating mode "Use
position value (SSI absolute val-
ue) as reference"
Meaning
Additional option-specific pa-
rameters
Between comparison value and
high limit
(default)
The respective digital output is active if:
Comparison value <= position value <= maximum
position value
• Comparison value 0
• Comparison value 1
• Hysteresis (in increments)
Between comparison value and
low limit
The respective digital output is active if:
0 <= position value <= comparison value
• Comparison value 0
• Comparison value 1
• Hysteresis (in increments)
Between comparison value 0 and
1
The digital output DQ1 is active if:
Comparison value 0 <= position value <= compari-
son value 1
• Comparison value 0
• Comparison value 1
• Hysteresis (in increments)
At comparison value for a pulse
duration
The respective digital output is active once for the
assigned time and direction of the position value
change when the position value is equal to the
comparison value or has fallen below or exceeded
it.
• Comparison value 0
• Comparison value 1
• Count direction
• Pulse duration
• Hysteresis (in increments)