Temperature Monitoring / Display And Fan Control - Siemens SIMATIC PC RI25/45 Technical Description

Monitoring Module
4.3

Temperature Monitoring / Display and Fan Control

Temperature The temperature is measured via a sensor (NTC) and its status is indicated
Monitoring
via a green LED for normal temperature and via a red LED for errors. The
following conditions may cause errors:
The temperature status can be checked at bit 0 of the I/O cell base address +
0Eh.
An error causes one of the following reactions:
TempLED changes from GREEN to RED
Canceling of TempBit in I/O cell base address + 0Eh
Relay output falls in quiet state
Initiate IRQ
Note
The NTC is a separate component and only connected to the monitoring
module via a plug connector. The NTC is equipped with cable and connector
and is part of the list of components. In order to guarantee correct
temperature monitoring, an NTC with a resistance of 10 kOhm is required
(SBS Order No. 57703-M103-G).
Monitoring Line The NTC resistance is commuted to a SafeCard connector via twisted pair
Break
cable. The errors "line break" and "connector unplugged" are additionally
monitored by open-circuit monitoring. A line break is signaled by a
temperature error.
4-6
Overrange of the acceptance limit of excess temperature
Underflow of the acceptance limit of insufficient temperature
Line break or temperature sensor unplugged
Reaction Option
always
always
always
can be set
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01