Siemens S7 Introduction

Siemens S7

Canvas supports Siemens S7 as a way to connect to devices that support this protocol. Users can set up the Slot Number and Rack Number of the S7. This will need to be correct to grab information from the correct device.

LOGO! 0BAx Series

Memory Area and Ranges

Memory Area	Symbol	Digital	Analog	Address Number System	Access
Process Inputs	I	I1 - I64	-	Decimal	R
Process Outputs	Q	Q1 - Q64	-	Decimal	R/W
Markers	M	M1 - M112	-	Decimal	R/W
Variables	V	V0.0 - V14697.7	V0 - V14697	Decimal	R/W
Analog Inputs	AI	AI1.0 - AI16.15	AI1 - AI16	Decimal	R
Analog Outputs	AQ	AQ1.0 - AQ16.15	AQ1 - AQ16	Decimal	R/W
Analog Makers	AM	AM1.0 - AM64.15	AM1 - AM64	Decimal	R/W
Function	F	F1 - F4	-	Decimal	R/W
Cursor	C	C1 - C4	-	Decimal	R/W

S7 Series

Memory Area and Ranges

Memory Area	Symbol	Digital	Analog	Address Number System	Access	Note
Process Inputs	I	I0.0 - I1023.7 (Max 65535.7)	I0 - I1023 (Max 65535)	Decimal	R	-
Process Outputs	Q	Q0.0 - Q1023.7 (Max 65535.7)	Q0 - Q1023 (Max 65535)	Decimal	R/W	-
Markers	M	M0.0 - M4095.7 (Max 65535.7)	M0 - M4095 (Max 65535)	Decimal	R/W	-
DB	DB	DB0,0.0 - DB65535,65535.7	DB0,0 - DB65535,65535	Decimal	R/W	Range varies depending on PLC program
Counters	C	-	C0 - C65535	Decimal	R/W	-
Timer	T	-	T0 - T65535	Decimal	R/W	-

Notes

• S7 1200/1500 notes:
  • Only global DBs can be accessed.
  • To access a DB memory area in S7 1200/1500, some additional settings in PLC software (TIA Portal) are required.
  • The optimized block access must be turned off.
    • Select the DB in the left pane under “Program blocks” and press [Alt+Enter]. (Or in the contextual menu, select “Properties…”)
    • Uncheck Optimized block access
    • 
  • The access level must be “full,” and the “connection mechanism” must allow GET/PUT.
    • Select the CPU project in the left pane and press [Alt+Enter]. (Or in the contextual menu, select “Properties…”.)
    • Select “Full access” and check “Permit access with PUT/GET …” as in the image below.
    •