Siemens SIMATIC Rack PC 840 Manual page 141

Connector to the Motherboard (X44)
Pin No. Designation
1 RUN_G
2 RUN_R
3 TEMP_ERR
4 Ethernet_LED
5 DP_LED
6 HD_LED
7 SPEAKER
8 RESET_N
9 NC
10 NC
11 NC
12 NC
13 GND
14 USB_D1P
15 USB_D1M
16 P5V_fused
17 M_DATA
18 M_CLK
19 K_DATA
20 K_CLK
21 PWR button
22 GND
23 P5V_fused
24 Soft Off
25 P12V
26 GND
External Reset (X30) Type: JST B2B-PH-SM3-TB
Pin No.
1
2
The device is reset when pins 1 and 2 (for example, via button) are short circuited.
It remains in this state until the short circuit has been remedied.
SIMATIC Rack PC 840 Manual
A5E00104826-03
Description
LED watchdog o.k., anode with 330Ω
in series on motherboard
LED watchDog error, anode with
330Ω in series on motherboard
LED temperature error, anode with
330Ω in series on motherboard
Ethernet LED, anode above 330Ω in
series on motherboard
PROFIBUS/MPI LED, anode above
150Ω in series on motherboard
HD LED, anode with 150Ω in series
on motherboard
Connection for system speaker
Reset signal (low active)
Ground
USB data
USB data
+5V (fused)
Mouse DATA
Mouse clock
Keyboard data
Keyboard clock
Connection pin for On/Off button at
the front
Ground
+5V (fused)
Power LED (yellow), anode above
150Ω in series on motherboard
Ground
Designation Description
PWRGood External reset, (IO low max.
30 mA)
GND Ground
Hardware Information
Input / Output
Output
Output
Output
Output
Output
Output
Output
Input
-
-
-
-
-
Input / Output
Input / Output
Output
Input / Output
Output
Input / Output
Output
Input
-
Output
Output
Output
-
Input / Output
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