Endress+Hauser gammapilot FTG 671, Operating Instructions Manual

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5.2 Acknowledgement mode
By entering 1 at V1H2 or V1H7, each relay may be set to operate in acknowledgement
mode. 0 reselects standard operation. Acknowledgement mode is suitable for applica-
tions which require a relay hold function. In this case, the relay is held in the attained
switching status even when the operational conditions would normally dictate a return
to the original status.
Step Matrix Entry Significance
1 V1H2 e.g. 1 Selects acknowledgement mode for relay 1
2 - »E« Registers entry
Depending upon the switching direction chosen, the relay energises or de-energises
when the switching condition is fulfilled. After switching, the relays return to initial status
only after the operator presses »E« when the confirmation field V1H4 (relay 1) or V1H9
(relay 2) is selected and the switch-back condition is fulfilled. Figs. 5.11 and 5.12 illustrate
the function.
time
BA082E49
switch-off point
switch-on point
Standard
Acknowledged
no acknowledgement
time
Acknowledgement
le
v
e
l
Acknowledged
with acknowledgement
Fig. 5.15:
Acknowledgement mode for
switch-off point < switch-on point
BA082E50
switch-on point
switch-off point
Standard
Acknowledged
no acknowledgement
le
v
e
l
Acknowledgement
Acknowledged
with acknowledgement
Fig. 5.16:
Acknowledgement mode for
switch-off point > switch-on point
Gammapilot FTG 671 Chapter 5: Limit Switches - Relays
45