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5
15. SIEMENS PLC 5-93
Connection to PLCs
S5 PG port
The assigned memory is indicated when editing the screen
as shown on the right.
S7-200PPI
S7-300/400MPI
The assigned memory is indicated when editing the screen as
shown on the right.
Memory TYPE Remarks
DB (data register) 0 Use memory address DB3 and later.
I (input relay) 1 IW as word device
Q (output relay) 2 QW as word device
F (flag/internal relay) 3 FW as word device
T (timer/current value) 4
C (counter/current value) 5
AS (absolute address) 6
Example: DB003 000
Address
Block number
Memory TYPE Remarks
V (data memory) 0 VW as word device
I (input) 1 IW as word device
Possible to write to the unused area
Q (output) 2 QW as word device
M (bit memory) 3 MW as word device
T (timer/current value) 4
C (counter/current value) 5
TB (timer/contact) 6 Read only
CB (counter/contact) 7 Read only
HC (high-speed counter/contact) 8 Double-word usable
AIW (analog input) 9
AQW (analog output) 10
SM (special memory/special relay) 11 SMW as word device
S (stage) 12 SW as word device
Memory TYPE Remarks
DB (Data Word) 0 Use memory address DB1 and later.
I (input) 1 IW as word device
Q (output) 2 QW as word device
M (Marker Word) 3 MW as word device
T (timer/current value) 4
C (counter/current value) 5
Example: DB003 000
Address
Block number