Time switch based on the S7-300/400 CPUs with simple HMI system
including radio-controlled clock connection
Rev. B - final 19.07.2002 31/84
Copyright © Siemens AG 2005 All rights reserved
BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc
Note
The input parameter ”EN” and the output parameter “ENO” are default parameters
at the S7 blocks. Closer information is available in the documentation and the
STEP7 online help.
Note
The time switching functions are discussed in detail below. The only different
parameter here is “Time_To_Check“ of the “UDT“ type, whose parameterization is
always given. All other parameters have the same structure for all different time
switching functions.
The Start and Reset parameters are subsequently referred to as control
parameters.
The following pulse diagram illustrates how the behavior of the input signals
“ReleaseClock“, “Time_To_Check“ and “Reset“, and the output “Clock
active“ relate to each other:
ime range
t is a programmed time range (time switch active)
Fig. 4-3 Pulse diagram
Note
The pulse diagram (Fig. 4-3) applies for all absolute function blocks, which are
described in detail below.
4.3.2 One-day time switch
The block for the one-day time switch “day” FB120 is parameterized as
illustrated in the figure below. Data block DB120 is used as instance data
block:
To Next Page
Loading...
