Siemens SIMATIC NET S7-300 User Manual

8 NCM S7 Diagnostics
A-281
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
8.6.2 Communication Connections Checklist
Table 8-6 Checklist for Typical Problems with ISO Transport / ISO-on-TCP / UDP Connections
Problem Possible Cause Identifying the Cause and Remedy
No data transfer on an
ISO transport connection
/
ISO-on-TCP connection
or only in one direction.
AG-SEND and AG-RECV
are not called in the user
program.
or
Receive or send buffer too
small or incorrect.
Check the user program.
Evaluate status bytes in AG-SEND and
AG-RECV.
What to do:
If necessary, configure FC blocks.
If necessary, correct ANY pointer.
The connection is not
established.
Evaluate status bytes of the FC blocks or
evaluate diagnostic buffer.
What to do:
Change the address parameters (MAC/IP
address, TSAP).
Data transfer too slow Receiving device too slow Evaluate diagnostic buffer.
Entry: “No receive resources on destination
station XX”.
What to do:
Delay the send trigger or check the destination
station and optimize reception.
The complete data field
is not sent on an ISO
transport /
ISO-on-TCP/UDP
connection.
LEN parameter for
AG-SEND is set to the
wrong value.
What to do:
Set the LEN parameter to the required size.
The complete data field
is not sent on an ISO
transport /
ISO-on-TCP/UDP
connection.
The buffer specified with
the ANY pointer is too
small.
What to do:
Correct the LEN parameter and the ANY pointer.

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)