5-9
Communications Processor CP 541
EWA 4NEB 812 6188-02
5.3
Safety Times
When using the safety-related PLC-PLC connection or the safety-related
broadcast, you must observe the process-dependent safety times. You must
agree the safety times with the inspector.
When using the CP 541 with S5-95F or S5-115F, you must comply with all
the safety conditions specified in the manual for the programmable control-
ler.
Please note: The S5-95F and S5-115F can only receive a new message when
the old message has been processed by the operating system.
You must set a monitoring time of 100 ms for the S5-95F or S5-115F with
parameter UPDL in DB1 of the CP 541. This ensures that message traffic is
organized so that there is an interval of at least 100 ms between two received
messages.
Safety Note
There is no useful message monitoring with message mode 115F-15. To pre-
vent an undetected loss of message from occurring, you may only change the
send mailbox once during the receive safety time.
The CP 541 can receive messages simultaneously from two or more SINEC
L2 stations; it executes intermediate storage of these messages.
Safety Note
On account of the intermediate storage of messages, you must deduct the
local cycle time for CP 541 reception (t
LUE
) from the SINEC L1 safety time
for receiving, specified by the inspector (see Section 5.3.3). You must enter
this time in COM.
Section
Contents
Page
5.3.1
Local Cycle Time for CP 541
5.3.2
Calculating the Local Cycle Time
5.3.3
Condition for the SINEC L1 Safety Time for Receiving
5.3.4
Setting the Safety Times
5.3.5
Example for Calculating the Local Cycle Times
5.3.6
Example of Verification of Safety Times
Introduction
Fundamental Rule
Interval for
Received
Messages
Receive Safety
Time
Summary of this
Section
CP 541 with S5-95F/S5-115F
