Programmable Controllers Module Specifications Reference Manual

M7-400 Expansions

12-24

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Table 12-7 MSM 478 Parallel Port, Socket X1 (25-Pin Sub D Socket)

Meaning Direction

1 /STROBE Input/output

2 Data 0 Input/output

3 Data 1 Input/output

4 Data 2 Input/output

5 Data 3 Input/output

6 Data 4 Input/output

7 Data 5 Input/output

8 Data 6 Input/output

9 Data 7 Input/output

10 /ACK Input

11 BUSY Input

12 PE Input

13 SLCT Input

14 /AUTO FEED Output

15 /ERROR Input

16 /RESET Output

17 /SLCT IN Output

18 GND –

19 GND –

20 GND –

21 GND –

22 GND –

23 GND –

24 GND –

25 GND –

Note

Operational ground (GND signal) at the COMa or COMb ports is referenced to

internal ground.

Suitable measures may be required on the process side to avoid ground loops.