Siemens SIMATIC NET S7-300 User Manual

7 Programming FCs (Functions) and FBs for S7 Ethernet CPs
A-210
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
User program
(CPU cycle)
Ethernet CP Communications Partner
LOCKED = 0
LOCKED = 0
AG_LOCK
AG_LOCK
AG_LOCK
LOCKED = 1
FETCH/WRITE
access to DB x
active
FETCH/WRITE
access to DB x
active
Time Time Time
Data
processing
in DB x
FETCH/WRITE
FETCH/WRITE rejected
AG_UNLOCK
STATUS = 700x
Cycle n
Cycle n+1
Cycle n+2
Cycle n+m
...
The lock job must first be monitored in the user program using the code in the
return parameter LOCKED. As long as LOCKED=0 is indicated, it must be
assumed that there is still a FETCH/WRITE access active.
If LOCKED=1 is indicated, this shows that the lock is active; data can now be
modified by the user program.
The status code is updated at each block call.

Siemens SIMATIC NET S7-300 Specifications

General

Product Type Designation	SIMATIC NET S7-300
Mounting	DIN rail mounting
Protection Class	IP20
CPU Models	Various models available (e.g., CPU 312, CPU 314)
Communication Interfaces	MPI, PROFIBUS DP
Power Supply	24 V DC power supply required. Different power supply modules available.
I/O Modules	Digital input modules, digital output modules, analog input modules, analog output modules
Programming	STEP 7 software
Supply Voltage	24V DC or 120/230V AC (depending on model)
Digital Inputs	Available via digital input modules
Digital Outputs	Available via digital output modules
Analog Inputs	Available via analog input modules
Analog Outputs	Available via analog output modules
Communication Functions	MPI, PROFIBUS DP, Ethernet (depending on model)
Protocols	MPI, PROFIBUS DP, TCP/IP (depending on model)
Operating Temperature	0°C to 60°C
Storage Temperature	70 °C
Memory	Depends on CPU model (e.g., 32 KB to 1.5 MB)