Siemens 620 appendix Meaning Pin X4/X3

Hardware Information

Pin	X41	Meaning	Pin	X4/X3	Meaning
1	RESET	Reset	1	RESET	Reset
2	GND		2	GND
3	D7	Data signal D7	3	D7	Data signal D7
4	D8	Data signal D8	4	D8	Data signal D8
5	D6	Data signal D6	5	D6	Data signal D6
6	D9	Data signal D9	6	D9	Data signal D9
7	D5	Data signal D5	7	D5	Data signal D5
8	D10	Data signal D10	8	D10	Data signal D10
9	D4	Data signal D4	9	D4	Data signal D4
10	D11	Data signal D11	10	D11	Data signal D11
11	D3	Data signal D3	11	D3	Data signal D3
12	D12	Data signal D12	12	D12	Data signal D12
13	D2	Data signal D2	13	D2	Data signal D2
14	D13	Data signal D13	14	D13	Data signal D13
15	D1	Data signal D1	15	D1	Data signal D1
16	D14	Data signal D14	16	D14	Data signal D14
17	D0	Data signal D0	17	D0	Data signal D0
18	D15	Data signal D15	18	D15	Data signal D15
19	GND		19	GND
20	n.c.	Coding	20	n.c.	Coding
21	DREQ	DMA Request	21	DREQ	DMA Request
22	GND		22	GND
23	IOW_N	IO Write	23	IOW_N	IO Write
24	GND		24	GND
25	IOR_N	I/O Read	25	IOR_N	I/O Read
26	GND		26	GND
27	IORDY	I/O Ready	27	IORDY	I/O Ready
28	Reserved		28	CSEL	Master/Slave
29	DACK_N	DMA Acknowledge	29	DACK_N	DMA Acknowledge
30	GND		30	GND
31	IOCS16	I/O Chip Select 16	31	IOCS16	I/O Chip Select 16
32	n.c.		32	n.c.
33	AD_1	Address 1	33	AD_1	Address 1
34	Reserved	reserved	34	reserved	reserved
35	AD_0	Address 0	35	AD_0	Address 0
36	AD_2	Address 2	36	AD_2	Address 2
37	CS1_N	Chip Select 1	37	CS1_N	Chip Select 1
38	CS3_N	Chip Select 3	38	CS3_N	Chip Select 3
39	HDACT_N	HD active	39	HDACT_N	HD active
40	GND		40	GND
			41	P5V	+5V power supply
			42	P5V	+5V power supply
			43	GND
			44	reserved	reserved

7-28	SIMATIC Box PC 620 Manual
	A5E00131465-01