Hardware Information
Release 11/02
7-5
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
7.4
Monitoring Functions
The LEDs described in the following sections are only available on specific
versions of the device. The basic configuration of the computer unit does not have
any LEDs. The hardware signals are described in section 7.5.2.
7.4.1
Overview
Function
The following individual functions are implemented:
S
temperature monitoring with error signal
S
watchdog with error signal
S
fan control
Messages of the monitoring modules can be passed on to applications.
The program SOM (Safecard on Motherboard) and Windows drivers are available
on the devices for this purpose. These tools can be used to display the status and
assign parameters to limit values.
7.4.2
Temperature monitoring and display
Temperature monitoring
The temperature is acquired by three sensors. One sensor monitors the processor
temperature, the second monitors the temperature in the processor module area
and the expansion boards, while the third monitors the temperature in the drive
area.
If one of the three temperature values exceeds the set temperature threshold, an
interrupt is triggered, starting an action parameterized in the SOM program.
The temperature drift will not occur if the device is used according to its intended
purpose. If it nonetheless occurs, check whether the following fault causes apply:
S
Are the vent slots covered?
S
Did the fan fail to operate?
S
Is the ambient temperature above the permitted value?
S
Has the total output power of the power supply been exceeded?
The temperature drift remains stored until the temperature falls under the threshold
value again and is reset by one of the following measures:
S
Acknowledgement of the error message by the SOM program
S
Restart of the device
Содержание Simatic PC Panel PC 870
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