Siemens SIMATIC PCS 7 CPU 410-5H User Manual

Link-up and update
8.3 Time monitoring
CPU 410-5H Process Automation
130 System Manual, 09/2014, A5E31622160-AB
Example of the calculation of T
P15
In the next steps, we take an existing system configuration and define the maximum
permitted time span of an update, during which the operating system does not execute any
programs or I/O updates.
There are two DP master systems and one IO subsystem: DP master system_1 is connected
via the DP interface of the CPU, and DP master system_2 is connected to the CPU via an
external DP master interface. The IO subsystem is connected via the integrated Ethernet
interface.
1. Based on the bus parameters in STEP 7:
T
TR_1
= 25 ms
T
TR_2
= 30 ms
T
DP_UM_1
= 100 ms
T
DP_UM_2
= 80 ms
2. Based on the configuration in STEP 7:
T
max_Akt
= 8 ms
T
PN_UM
= 110 ms
3. Based on the technical data of the DP slaves used:
T
SLAVE_UM_1
= 30 ms
T
SLAVE_UM_2
= 50 ms
4. Based on the technical specifications of the PN devices used:
T
Device_UM
= 20 ms
5. Based on the technological settings of your system:
T
PTO_1
= 1250 ms
T
PTO_2
= 1200 ms
T
PTO_PN
= 1000 ms
6. Based on the user program:
T
WA
= 300 ms
T
PROG
= 50 ms
7. Based on the formula [1]:
T
P15
(DP master system_1)
= 1250 ms - (2 x 25 ms + 300 ms + 50 ms + 100 ms + 30 ms) = 720 ms
T
P15
(DP master system_2)
= 1200 ms - (2 x 30 ms + 300 ms + 50 ms + 80 ms + 50 ms) = 660 ms

Siemens SIMATIC PCS 7 CPU 410-5H Specifications

General

Brand	Siemens
Model	SIMATIC PCS 7 CPU 410-5H
Category	Controller
Language	English