Ropex RES-445 - Page 23

Startup and operation
RES-445 Page 23
3. "Active if Tact = Tset", with latch function
(as of software revision 100)
Relay K1 is closed if the actual value is inside the
specified temperature tolerance band (steps 207,
208). If the actual temperature leaves the tolerance
band once
while the "START" signal is active, relay
K1 is opened. The relay is not closed again until the
next "START" signal is activated. The switching
state of relay K1 can thus also be interrogated by
the higher-level PLC after a heatsealing process
(latch function, see graph below).
Other settings are available in this menu when time
control (timer function) is active. They are described in
section 10.24.7 "Relay K1 (with time control)" on
page 56.
9.3.9 “Output 1“/
„Temperature OK“ signal
(without time control)
On controllers up to software revision 027,
the switching output at terminals 20+21 was
called "Temperature OK". The more general name
"Output 1" is used as of software revision 100
because this output now also supports other func-
tions.
The "Output 1" signal is available at terminals 20+21 as
a digital control signal.
Up to software revision 027:
The RES-445 checks whether the ACTUAL tempera-
ture is inside a specifiable tolerance band ("OK"
window) on either side of the SET temperature. The
lower ( ) and upper ( ) limits of the tole-
rance band can be changed independently of one ano-
ther by means of steps 24+25 in the Configuration
menu.
If the actual temperature is inside the specified toler-
ance band, the output signal at terminals 20+21 is
switched (see graph below):
The ACTUAL temperature is evaluated, and
the output signal at terminals 20+21 acti-
vated, in all operating states except when a fault is
signaled.
Set
NO contact of
Set+

lower
Set+

upper
Actual value
Time
Time
Open
Closed
Relay K1
!
RES-445
+24VDC
21
I
max
50mA
20
GND
GND

lower

upper
Soll
"Output 1"
Set+

lower
Set+

upper
Actual value
Time
Time
Not conduct.
Conductive
Terminals 20+21
!