Siemens Simatic S7 Series System Manual

Special memory (SM) and system symbol names
D.14 SMB36-45 (HSC0), SMB46-55 (HSC1), SMB56-65 (HSC2), SMB136-145 (HSC3): high-speed counters
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
677
S7-200 SMART
symbol name
SM address
Description
HSC2_Dir
SM57.3
HSC2 direction control bit: 1 = count up
HSC2_Dir_Update SM57.4 HSC2 update direction: 1 = update direction
HSC2_PV_Update
SM57.5
HSC2 update preset value: 1 = write new preset value to HSC2 preset
HSC2_CV_Update
SM57.6
HSC2 update current value: 1 = write new current value to HSC2 current
HSC2_Enable
SM57.7
HSC2 enable bit: 1 = enable
HSC2_CV
SMD58
HSC2 new current value
SMD58 is used to set HSC2 current value to any value you choose. To
update the current value, write SMD58 with the desired new current value,
write SM57.6 to 1, and execute the HSC instruction. The new current value
is then written to HSC2's current count register.
HSC2_PV
SMD62
HSC2 new preset value
SMD62 is used to set HSC2 preset value to any value you choose. To up-
date the current value, write SMD62 with the desired new current value,
write SM57.5 to 1, and execute the HSC instruction. The new preset value
is then written to HSC2's preset register.
Table D- 12 High-speed counter 3 configuration and operation
S7-200 SMART
symbol name
SM address
Description
HSC3_Status
SMB136
HSC3 counter status
Note
: Counter status bits are valid only while an interrupt routine triggered
by a high-speed counter event is being executed.
SM136.0–SM136.4
Reserved
HSC3_Status_5
SM136.5
HSC3 current counting direction status bit: 1 = counting up
HSC3_Status_6
SM136.6
HSC3 current value equals preset value status bit: 1 = equal
HSC3_Status_7 SM136.7 HSC3 current value is greater than preset value status bit: 1 = greater than
HSC3_Ctrl
SMB137
HSC3 counter control
SM137.0–SM137.2 Reserved
HSC3Dir
SM137.3
HSC3 direction control bit: 1 = count up
HSC3_Dir_Update
SM137.4
HSC3 update direction: 1 = update direction
HSC3_PV_Update
SM137.5
HSC3 update preset value: 1 = write new preset value to HSC3 preset
HSC3_CV_Update
SM137.6
HSC3 update current value: 1 = write new current value to HSC3 current
HSC3_Enable
SM137.7
HSC3 enable bit: 1 = enable

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.