Siemens Simatic S7-200 CPU 210 System Manual page 51

Table 3-2 provides a listing of the STL program for the sample program. This program
includes the control logic from Section 3.2. The program ends with the End instruction
(MEND).
Table 3-2
STL
NETWORK 1
LD I0.3
LDW>= T0, +600
A I0.2
OLD
S M0.1, 1
S Q0.3, 1
R M0.2, 1
NETWORK 2
LDN I0.0
ON I0.1
A I0.2
AN M0.1
AW>= T2, +900
S M0.2, 1
NETWORK 3
LD M0.2
TON T0, +0
NETWORK 4
LD I0.2
S M0.0, 1
TON T2, +0
NETWORK 5
LDN I0.2
EU
AN I0.3
R M0.0, 1
R M0.1, 1
R M0.2, 1
R Q0.3, 1
NETWORK 6
LDN I0.2
LDN I0.0
ON I0.1
ALD
A SM0.5
ED
R M0.0, 1
NETWORK 7
LDN I0.2
LDN I0.0
ON I0.1
ALD
A SM0.5
EU
S M0.0, 1
NETWORK 8
LD M0.0
= Q0.0
S7-200 Programmable Controller, CPU 210
C79000-G7076-C235-01
Sample Program in Statement List
Description
// if (the panic alarm has been turned on)
// or (if the alert timer is >= 60 seconds
//
// then
// set High Level Alarm bit
// set Modem Dialer bit
// reset Low Level Alarm bit
// if zone 1 is open
// or if zone 2 is open
// and the system is armed
// and the high-level alarm bit is not set
// and the exit timer is less than 90 seconds
// then set the low-level alert bit
// if the low-level alert bit has been set,
// then start the alert timer
// when the system is armed
// set the LED bit
// and start the exit timer
// if the system is not armed
// and the panic alarm is not on
// then
// reset LED bit
// reset High Level Alarm bit
// reset Low Level Alarm bit
// reset Modem Dialer
// if the system is not armed
// and if zone 1 is open
// or zone 2 is open
// and
// using the 1/2 second counter SM bit
// on the negative edge
// reset the LED bit
// if the system is not armed
// and if zone 1 is open
// or zone 2 is open
// and
// using the 1/2 second counter SM bit
// on the positive edge
// set the LED bit
// if the LED bit has been set
// turn on the LED output
Getting Started with a Sample Program
and the system is armed)
3-11