Siemens SIMATIC Rack PC 840 - Page 141

Hardware Information
7-33
SIMATIC Rack PC 840 Manual
A5E00104826-03
Connector to the Motherboard (X44)
Pin No.
Designation Description Input / Output
1 RUN_G LED watchdog o.k., anode with 330Ω
in series on motherboard
Output
2 RUN_R LED watchDog error, anode with
330Ω in series on motherboard
Output
3 TEMP_ERR LED temperature error, anode with
330Ω in series on motherboard
Output
4 Ethernet_LED Ethernet LED, anode above 330Ω in
series on motherboard
Output
5 DP_LED PROFIBUS/MPI LED, anode above
150Ω in series on motherboard
Output
6 HD_LED HD LED, anode with 150Ω in series
on motherboard
Output
7 SPEAKER Connection for system speaker Output
8 RESET_N Reset signal (low active) Input
9 NC -
10 NC -
11 NC -
12 NC -
13 GND Ground -
14 USB_D1P USB data Input / Output
15 USB_D1M USB data Input / Output
16 P5V_fused +5V (fused) Output
17 M_DATA Mouse DATA Input / Output
18 M_CLK Mouse clock Output
19 K_DATA Keyboard data Input / Output
20 K_CLK Keyboard clock Output
21 PWR button Connection pin for On/Off button at
the front
Input
22 GND Ground -
23 P5V_fused +5V (fused) Output
24 Soft Off Power LED (yellow), anode above
150Ω in series on motherboard
Output
25 P12V Output
26 GND Ground -
External Reset (X30) Type: JST B2B-PH-SM3-TB
Pin No. Designation Description Input / Output
1 PWRGood External reset, (IO low max.
30 mA)
2 GND Ground
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.