Siemens Simatic S7 Series System Manual

Special memory (SM) and system symbol names
D.15 SMB66-SMB85, SMB166-SMB169, SMB176-SMB179, and SMB566-SMB579: PTO0, PWM0, PTO1,
PWM1, PTO2, and PWM2 high-speed outputs
S7-200 SMART
678 System Manual, 09/2015, A5E03822230-AC
S7-200 SMART
symbol name
SM address
Description
HSC3_CV
SMD138
HSC3 new current value
SMD138 is used to set HSC3 current value to any value you choose. To
update the current value, write SMD138 with the desired new current value,
write SM137.6 to 1, and execute the HSC instruction. The new current value
is then written to HSC3's current count register.
HSC3_PV
SMD142
HSC3 new preset value
SMD142 is used to set HSC3 preset value to any value you choose. To
update the current value, write SMD142 with the desired new current value,
write SM137.5 to 1, and execute the HSC instruction. The new preset value
is then written to HSC3's preset register.
D.15
SMB66-SMB85, SMB166-SMB169, SMB176-SMB179, and
SMB566-SMB579: PTO0, PWM0, PTO1, PWM1, PTO2, and PWM2
high-speed outputs
The S7-200 SMART CPU uses SMB66-SMB85, SMB166-SMB169, and SMB176-SMB179
to monitor and control the pulse train outputs (PTO0 and PTO1) and pulse width modulation
outputs (PWM0 and PWM1), for the PLS (Pulse) instruction.
SMB566-SMB579 are used to monitor and control pulse train output PTO2 and pulse width
modulation output PWM2.
Table D- 13 High-speed output 0 configuration and control
S7-200 SMART
symbol name
SM address
Function
PTO0_Status
SMB66
PTO0 Status
PLS0_Abort_AE
SM66.4
PTO0 profile was aborted due to an add error: 0=no abort; 1=aborted
PLS0_Disable_UC SM66.5 PTO0 user manually disabled a PTO profile while it was running: 0=not
disabled; 1=manually disabled
PLS0_Ovr SM66.6 PTO0 pipeline overflow/underflow, loading pipeline while full or transfer-
ring an empty pipeline: 0=No overflow; 1=Pipeline overflow/underflow
PLS0_Idle
SM66.7
PTO0 idle: 0=PTO in progress; 1=PTO is idle
PLS0_Ctrl
SMB67
Monitor and control PTO0 (Pulse Train Output) and PWM0 (Pulse Width
Modulation) for Q0.0
PLS0_Cycle_Update SM67.0 PTO0/PWM0 update the cycle time or frequency value: 0=no update; 1=
write new cycle time/frequency
PWM0_PW_Update SM67.1 PWM0 update the pulse width value: 0=no update; 1= write new pulse
width
PTO0_PC_Update SM67.2 PTO0 update the pulse count value: 0=no update; 1= write new pulse
count
PWM0_TimeBase
SM67.3
PWM0 time base: 0=1 μs/tick, 1=1 ms/tick
SM67.4
Reserved

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.