Siemens 3RS2

5.4.3 Temperature monitor TW
The temperature monitor (TW) is a device function in which the device is automatically reset on
activation, as soon as the sensor temperature has overshot or undershot the set limit by the
hysteresis value.
The possible settings include the monitoring for limit value overshoot and undershoot, as well
as the monitoring of the hysteresis. If the relay output (K1) between terminals 11C and
14NO (quiescent current principle) is switched o󹪜, the device is in the safe operating state.
A parameter change is prevented by a 3-digit code.
init
A1/A2
K2K1
DEV. MODE = TW
MON. MODE = Over
DEV. MODE = TW
MON. MODE = Under
11C/14NO
11C/12NC
21C/24NO
21C/22NC
11C
14NO12NC 11C
14NO 12NC
24NO22NC 21C
21C 24NO 22NC
A1/A2
init
ϑ
ϑ2
hyst.
hyst.
K1
K2
A1/A2
K1
K2
ϑ1
ϑ2
hyst.
hyst.
ϑ1> 2
ϑ1<ϑ2
ϑ
init
1
2
1
2
1
2
1
2
1
2
1
1 2
2
1
2
1
2
init
K1
K2
A1/A2
ϑ2
ϑ1
hyst.
hyst.
K1
K2
ϑ2
ϑ1
hyst.
hyst.
1
Figure 5-5 Temperature monitor time diagram
Digital devices
5.4 Special functions
3RS2 temperature monitoring relay
30 Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002