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)
Pin
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.
