SR Flip-Flop
Input 1 (Set)
Input 2 (Reset)
Output
0
0
Value remains the same
0
1
0 (Reset)
1
0
1 (Set)
1
1
1 (Set has priority)
This block is Set Dominant (Set has priority if both inputs
are On).
9.5.2 Function Blocks
Function Blocks provide built-in functionality for most common applications in one block. While it is possible to design a
configuration without any function blocks, using the Function Blocks offers substantial efficiency, ease of use, and
improved functionality.
Most Function Blocks expect the corresponding safety input device to be connected to it. The Check List on the left creates
a notification if any required connections are missing. Depending on the application, some Function Blocks may be
connected to other Function Blocks and/or Logic Blocks.
Dual-channel safety input devices have two separate signal lines. Dual-channel signals for some devices are both positive
(+24 V dc) when the device is in the Run state. Other devices may have a complementary circuit structure where one
channel is at 24 V dc and the other is at 0 V dc when the device is in the Run state. This manual uses the Run state/Stop
state convention instead of referring to a safety input device as being On (24 V dc) or Off (0 V dc).
Bypass Block
Default Nodes
Additional Nodes
Notes
IN
BP
-
When the BP node is inactive, the safety signal simply passes through the Bypass Block. When the BP
node is active, the output of the block is On regardless of the state of the IN node (if the Output turns Off
when both inputs (IN&BP) are On checkbox is clear). The Bypass Block output turns Off when the bypass
timer expires.
M0:SO1
A1 Output
M0:BP1
Bypass
Function Block
Figure 58. Timing Diagram—Bypass Block
Bypass Time Limit—A bypass function time limit must be established to limit how long the safety input device bypass is
active. The time limit can be adjusted from 1 second (default) to 12 hours and cannot be disabled. Only one time limit can
be set, and this limit will apply to all safety devices that are bypassed. At the end of the time limit, the safety output control
authority is transferred back to the bypassed safety input devices.
Two-Hand Control Bypassing—The Safety Controller issues a Stop signal if a Two-Hand Control input is actuated while the
input is being bypassed. This ensures that the operator does not mistakenly assume that the Two-Hand Control is
functional; unaware that the Two-Hand Control is bypassed and no longer providing the safeguarding function.
XS/SC26-2 and SC10-2 Safety Controllers
80
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