Number Of Messages In The Diagnostics Buffer; Monitoring Time For Transferring Parameters To Modules - Siemens SIMATIC S7-400H Manual

Configuring with STEP 7

Number of messages in the diagnostics buffer

You specify the number of messages in the diagnostics buffer on the
"Diagnostics/Clock" tab.
We recommend that you set a large number (1500, for example).

Monitoring time for transferring parameters to modules

You specify this monitoring time on the "Startup" tab. It depends on the
configuration of the fault-tolerant station. If the monitoring time is too short, the
CPU enters the W#16#6547 event in the diagnostics buffer.
For some slaves (e.g. IM 157) these parameters are packed in system data
blocks. The transmission time of the parameters depends on the following factors:
• Baud rate of the bus system ( high baud rate => short transmission time)
• Size of the parameters and the system data blocks (long parameter => long
transmission time)
• Load on the bus system (many slaves => long transmission time);
Note: The bus load is at its peak during restart of the DP master, for example,
following Power OFF/ON
Suggested setting: 600 corresponds to 60 sec.
Note
The special H CPU parameters and the associated monitoring times are calulated
automatically. This involves setting a default value for the total memory load of all
data blocks specifically for a CPU. If your H system does not link up, check the
memory load setting (HW Config –> CPU Properties –> H Parameters –> Work
memory used for all data blocks).
Notice
CP443-5 Extended may be only used in an S7-400H or S7-400FH when
connecting a DP/PA-Link or Y-Link (IM157) with a transmission rate up to 1.5
Mbaud. (Help: see FAQ 11168943 at
http://www.siemens.com/automation/service&support)
9-6
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07