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3 Methods for Safety Programming
3.6
Programming logic operations
Tasks of the blocks
Generate release signals to control the safety-related actuators based on the
relevant safety functions
Link the sensor enables, operating mode enables, etc. to the control signals of
the actuators
Recommendation
Use mainly AND and OR logic elements
Reduce the use of SR blocks to a minimum
Avoid jumps in binary logic
3.7
Programming mode-dependent safety functions
Recommendation
Divide the logic into different levels (see IEC 62061):
Level 1: All safety functions that are independent of modes and plant statuses.
–
Logic ANDing of all safety functions that are always active.
–
These are typically emergency stop facilities.
Level 2: All mode-dependent safety functions.
–
Logic ORing of safety functions that are only active in certain modes.
–
For example, safety doors in automatic mode, alternating with enabling
buttons in service mode.
Example
Three safety functions are implemented on a machine: The "estop" emergency
stop function is active in each mode. The "guardDoor" safety door monitoring and
the "enablingSwitch" enabling function are only active in one mode.
Figure 3-8: Programming modes
Safety Programming Guideline
Entry ID: 109750255,
V1.0,
10/2017
26