sepam 20 user manual - Schneider Electric
sepam 20 user manual - Schneider Electric
sepam 20 user manual - Schneider Electric
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DE50675<br />
DE50676<br />
DE50677<br />
DE50678<br />
DE50679<br />
DE50680<br />
Control and monitoring<br />
functions<br />
The symbols used in the different block<br />
diagrams describing the control<br />
and monitoring functions are defined<br />
on this page.<br />
Logic functions<br />
b "OR"<br />
Equation: S = X + Y + Z.<br />
b "AND"<br />
Equation: S = X x Y x Z.<br />
b exclusive "XOR"<br />
PCRED301005EN - 06/<strong>20</strong>08<br />
DE50681<br />
DE50682<br />
Definition of symbols<br />
Pulse mode operation<br />
b "on" pulse: used to create a short-duration pulse (1 cycle) each time a signal<br />
appears<br />
b "off" pulse: used to create a short-duration pulse (1 cycle) each time a signal<br />
disappears.<br />
Note: the disappearance of a signal may be caused by an auxiliary power failure.<br />
S = 1 if one and only one input is set to 1<br />
(S = 1 if X + Y + Z = 1). Bistable functions<br />
Bistable functions may be used to store values.<br />
b Complement<br />
These functions may use the complement of one or<br />
more input values.<br />
Equation: S = X (S = 1 if X = 0).<br />
Delay timers<br />
Two types of delay timers:<br />
b "on" delay timer: used to delay the appearance of a<br />
signal by a time T<br />
b "off" delay timer: used to delay the disappearance of<br />
a signal by a time T.<br />
DE50683<br />
Equation: B = S + R x B.<br />
4/3<br />
4
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