Siemens PANEL PC 877 User Manual
Detailed descriptions
17.1 Motherboard
SIMATIC Panel PC 877
17-16
Operating instructions, Release 07/2006, A5E00877780-01
I/O front interface for operator panels, X44
This interface carries all signals required for the connection of operator panels in addition to
the display and USB interface. The maximum cable length is 50 cm at a USB data rate of 12
Mbps.
Pin No.
Abbreviation
Meaning
Input/Output
1
GND
Ground
-
2
P12V
Inverter voltage supply
Output
3
BL_ON
Backlight ON (5 V = ON)
Output
4
P5V_fused
+5 V (fused)
Output
5
GND
Ground
-
6
P3V3_fused
+3.3 V VCC (fused)
Output
7
K_CLK
Keyboard clock channel
Output
8
K_DATA
Keyboard data channel
Input/Output
9
M_CLK
Mouse clock channel
Output
10
K_DATA
Mouse data channel
Input/Output
11
P5V_fused
+5 V (fused)
Output
12
USB_D1M
USB data channel 1
Input/Output
13
USB_D1P
USB data+, channel 1
Input/Output
14
GND
Ground
-
15
LCD_SEL0
Display type - Select signal 0
Input
16
LCD_SEL1
Display type - Select signal 1
Input
17
LCD_SEL2
Display type - Select signal 2
Input
18
LCD_SEL3
Display type - Select signal 3
Input
19
RESET_N
Reset signal (active low)
Input
20
Power button
Power button function front
Input
21
HD_LED
HD LED, anode with 1 kW in series on the
motherboard
Output
22
DP_LED
MPI/DP LED, anode via 1 kohm in series on the
motherboard
Output
23
Ethernet_LED
Ethernet LED, anode with 1 kW in series on the
motherboard
Output
24
TEMP_ERR
Temperature error LED, anode with 1 kW in series
on the motherboard
Output
25
RUN_R
Watchdog error LED, anode with 1 kW in series on
the motherboard
Output
26
RUN_G
Watchdog OK LED, anode with 1 kW in series on
the motherboard
Output