Parameters/address space
4.9 Safety functions
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
58 Equipment Manual, V1.0, 01/2021, A5E47073911-AA
Using SDI monitoring
The safe direction is stored when SDI monitoring is initiated by enabling the "Enable Safe
Direction" bit and is used for the entire SDI monitoring session. While the SDI monitoring
session is in progress, subsequent changes to the "Safe Direction" bit are ignored.
Your safety program examines the "Safe Direction Event" bit in the feedback interface and
takes appropriate action during the SDI monitoring session.
Set the "Reset Safe Direction" bit to 1 to clear the "Safe Direction Event" bit in the feedback
interface.
If you want to start a new SDI monitoring session, clear and enable the "Enable Safe
Direction" bit must be cleared in the module and then once again set in the module by
separate executions of you safety program.
ce set, the "Safe Direction Event" bit is also cleared by a power cycle, or when a new STEP
7 hardware configuration is downloaded. If you reset the "Safe Direction Event" and the safe
direction is still in violation, the "Safe Direction Event" bit will immediately set back to 1.
SDI suspension by external events
SDI monitoring suspension can result from the following external events:
• Software gate closure
• Counting limit violation if module is configured to stop counting when the limit is
violated. Refer to "Reactions to counting limit violation" for additional information.
Note
Counting operations that set the start value or exceed configured counting li
mits have no
effect in determining whether a safe direction violation has occurred.
This means that regardless of how the "Reaction to violation of a counting limit" is configured
and the current count is subsequently manipulated, the "Safe Direction Event" is only initiated
upon actual violation of the specified "Monitoring tolerance".
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