5-83
Input functions
Dual channel direct opening input
This function is for connecting safety devices with dual channel direct opening action mechanisms,
such as an emergency stop switch or an interlock switch. As shown in Fig. 5-1, this function is
comprised of a dual channel input receive circuit (X
n
, X
n+1
), drive circuit (T
n
, T
n+1
), and function
output (I
n
).
Fig. 5-1 Circuit for dual channel direct opening input functions
Connects to
Safety devices with direct opening mechanisms, such as an emergency stop switch or an
interlock switch.
Note: This cannot be connected to a safety light curtain or other safety solid state outputs.
Description of operation
The operation timing is described in Fig. 5-2.
I. When safety check signals from the 2 drive circuits are supplied to the 2 receiving
circuits, the output is turned ON. (Ex. Emergency stop switch is released, the guard is
closed.)
II.
When safety check signal to either of the receiving circuits is turned OFF, the output is
turned OFF. (Ex. Emergency stop switch is released, the guard is opened.)
III. If safety check signals are not correctly supplied to the receiving circuits, due to the
error in the safety device or input circuit, the output is turned OFF immediately. Status
of any detected error is reflected by the error LED, input LEDs and monitor output. (Ex.
Fault in emergency stop switch or interlock switch, or wiring.)
Fig. 5-2 Operation timing of a dual channel direct opening input function
X
n
T
n
X
n+1
T
n+1
I
n
Safety device
Dual Channel
Direct Opening
Summary of Contents for SG EASY One
Page 1: ...Safety Control Unit INSTRUCTION MANUAL...
Page 34: ......
Page 70: ...5 28 Using an DATALOGIC AUTOMATION light curtain SE series as S1 S2...
Page 71: ...5 29 Timing chart Logic 3...
Page 74: ...5 32 Logic circuit Logic 4...
Page 80: ...5 38 Timing chart Logic 4...
Page 81: ...5 39...
