Eaton ELC-PB, Programming Manual

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2.10 S Relay
Initial step relay
Starting instruction in Sequential Function Chart (SFC).
Zero return step relay Returns to zero point when using IST instruction in program. Zero
return step relays not used for IST instruction can be used as
general step relays.
General purpose step relay S20 ~ S511, total 492 points (for ELC-PC/PA/PH controllers); S20
~ S499, total 480 points (for ELC-PV controllers); S128 ~ S911,
total 784 points (for ELCM-PH/PA controllers). General relays in
sequential function chart (SFC). They will be cleared if power is
lost after running.
Latched step relay S512 ~ S895, total 384 points (for ELC-PC/PA/PH controllers);
S20 ~ S127, total 108 points (for ELC-PB, ELCB-PB, ELCM-
PH/PA controllers); S500 ~ S899, total 400 points (for ELC-PV
controllers). In sequential function chart (SFC), latched step relay
will be saved when power is lost after running. The state of power
on after power is lost will be the same as the state before power
loss.
Alarm step relay S896 ~ S1023, total 128 points (for ELC-PC/PA/PH controllers);
S900 ~ S1023, total 124 points (for ELC-PV controllers); S912 ~
S1023, total 112 points (for ELCM-PH/PA controllers). The step
relay for alarm uses with alarm drive instruction ANS to the
contact for alarm. It is used to record warnings and eliminate
external malfunctions.
2.11 T (Timer)
The timer increment in units of 1ms, 10ms and 100ms and the counting method is counting up.
When the present value in the timer equals the set value, the associated output coil will be ON. The
set value should be a K value in decimal and can be specified by the content of data register D.
The actual set time of the timer = timer resolution × set value
Ex: If the set value is K200 and timer resolution is 10ms, the actual set time in the timer will be
10ms * 200 = 2000ms = 2 sec.
General Timer
For ELC-PB/PC/PA/PH, ELCB-PB, and ELCM-PH/PA controllers: The timer executes once when
the program reaches END instruction. When TMR instruction is executed, the timer coil will be ON
when the timing reaches its preset value.
For ELC-PV controllers: The timer executes once when the program reaches TMR instruction.
When TMR instruction is executed, the timer coil will be ON when the timing reaches its preset
value.
When X0 = ON, TMR instruction is driven. When current value reaches K100, the associated timer
contact, T0, turns ON to drive output Y0. If X0 = OFF or the power is off, the current value in T0
will be cleared as 0 and output Y0 driven by contact T0 will be OFF.