User manual

Function relays

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Function relays Function relays allow you to simulate the functions of different

conventional control engineering devices in your circuit

diagram. EZ provides the following function relays:

Table 8: Function relays

A latched relay is automatically switched off if the power

fails or if the device is in STOP mode. Exception: Retentive

coils retain signal 1 (

J section “Retention (non-volatile

data storage)”, page 226).

EZ circuit diagram

symbol

Function relays

A1, A2 Analog value comparator, threshold

value switch (only useful for devices

with an analog input)

C1, CC1, DC1, RC1 Counter relay, up/down counter, high-

speed counter, frequency counter

D2, ÄD2 Text, output user-defined texts, enter

values

Ö1, Ö2 Time switch, weekday/time

O1, ÄO2 Operating hours counter with limit

value entry.

T1,

TT1, RT1, HT1

, ?X

Timing relay, on-delayed

Timing relay, on-delayed with random

switching

T1,

TT1, RT1, HT1

, ?â

Timing relay, off-delayed

Timing relay, off-delayed with random

switching

T6,

TT6, RT6, HT6

Xâ, ?Xâ

Timing relay, on/off-delayed

Timing relay, on/off-delayed with

random switching

T2,

TT2, RT2, HT2

Timing relay, single pulse

EZ500_700.book Page 95 Tuesday, May 3, 2005 5:15 PM