Eaton easySafety, Manual

Page: 490 / 695

Safety function blocks
486
02/16 MN05013001Z EN
Memory requirement
The function block TH requires 24 bytes of memory.
Operation of the function block
If you actuate the two hand button, the function block coils
will switch as follows:
• 1-channel operation:
– the coils TH..I1 and TH..I2 pick up.
• 2-channel operation:
– the coils TH..I1 and TH..I3 pick up.
– the coils TH..I2 and TH..I4 drop out.
If this occurs within a fixed time of 500 ms, the enable
contact TH..QS closes and enables operation.
If one of coils picks up or drops out, the enable is removed,
the enable contact TH..QS opens and the hazardous move-
ment is stopped.
Error detection and acknowledgement
The function block detects the non-synchronous switching of
the two hand buttons. Both switches must achieve the same
switch state within a fixed time of 500 ms.
General information on Errors and how easySafety reacts to
them, is provided in the section “Diagnostics using the ER
contact” on page 622.
Error Error acknowledgement
Timeout of the 500
ms • 1-channel operation:
– Dropping out of TH..I1 and TH..I2
• 2-channel operation:
– Dropping out of TH..I1 and TH..I3
– Picking up of TH..I2 and TH..I4