Controller functions
Version 1
RES-406
Page 31
7.6.5
Temperature OK (TO)
The RES-406 checks whether the actual temperature is within a settable tolerance band ("OK" window) on either
side of the set temperature. The lower (
) and upper (
) limits of the tolerance band can be
changed independently of one another by means of the parameter data (
section 7.7 "Parameter data" on
page 34). The following settings are possible:
1.
„off“
The „TO“ bit is always deactivated.
2.
„Active if Tact = Tset“
(Factory setting up to software revision 017
and as of software revision 103
The „TO“ bit is activated if the actual value is inside the specified temperature tolerance band. If the actual tem-
perature is outside the tolerance band the „TO“ bit is deactivated (see graph below).
Unlike the "Temperature reached" status bit ("TE" bit), the actual temperature is evaluated independently of the
control mode.
3.
„Active if Tact = Tset, with latch function
(as of software revision 100 available)
(Factory setting for software revision 100…102)
A heatsealing cycle starts when the "ST" bit is set. The "TO" bit is set when the actual temperature reaches the
temperature tolerance band for the first time during a heatsealing cycle. If the actual temperature leaves the
tolerance band again - while the "ST" bit is still set - the "TO" bit is reset (refer to Fig. a.). If the actual tempe-
rature does not leave the tolerance band again - while the "ST" bit is still set - the "TO" bit is not reset until the
start of the next heatsealing cycle (latch function, refer to Fig. b.). The switching state of the "TO" bit can thus
be queried after the "ST" bit has been reset and before the start of the next heatsealing cycle.
Δϑ
lower
Δϑ
upper
Set
"TO" bit
Set+
Δϑ
lower
Set+
Δϑ
upper
Actual value
Time
Time
0
1
