Lockout/Tagout
Hazardous energy (lockout/tagout) must be controlled in machine maintenance and servicing situations in which the
unexpected energization, start up, or release of stored energy could cause injury. Refer to OSHA 29CFR 1910.147, ANSI
2244.1, ISO 14118 , ISO 12100 or other relevant standards to ensure that bypassing a safeguarding device does not
conflict with the requirements that are contained within the standards.
WARNING: Limit Use of Bypass Function
The Bypass function is not intended for production purposes; it is to be used only for
temporary or intermittent actions, such as to clear the defined area of a safety light screen if
material becomes "stuck". When Bypass is used, it is the user's responsibility to install and use it
according to relevant standards (such as ANSI NFPA79 or IEC/EN60204-1).
Safe Working Procedures and Training
Safe work procedures provide the means for individuals to control exposure to hazards through the use of written
procedures for specific tasks and the associated hazards. The user must also address the possibility that an individual
could bypass the safeguarding device and then either fail to reinstate the safeguarding or fail to notify other personnel of
the bypassed condition of the safeguarding device; both cases could result in an unsafe condition. One possible method to
prevent this is to develop a safe work procedure and ensure personnel are trained and correctly follow the procedure.
Enabling Device Block
Default Nodes
Additional Nodes Notes
ED
IN
RST
ES
JOG
An Enabling Device Block must be connected directly to an Output Block. This method assures that the
final control of the outputs is given to the operator holding the Enabling Device. Use the ES node for
safety signals that should not be bypassed by the ED node. If no other inputs of the function block are
configured, using an Enabling Device function block is not required.
t
limit
M0:SO1
M0:ES1
M0:ED1
M0:OS1
M0:MR1
Enable Mode
ES1 & ED1 have On/Off Control
Enabling Device
Function Block
Figure 17. Timing Diagram—Enabling Device, Simple Configuration
XS/SC26-2 Safety Controller
27
To Next Page
Loading...
Need help?
General
