General information
Product type designation		CPU 315-2 DP
HW functional status		01
Firmware version		V3.3
Product function
● Isochronous mode		Yes
Engineering with
● Programming package		STEP 7 V5.5 + SP1 or higher or STEP 7 V5.2 + SP1 or higher with HSP 218
Supply voltage
Rated value (DC)		24 V
permissible range, lower limit (DC)		19.2 V
permissible range, upper limit (DC)		28.8 V
external protection for power supply lines (recommendation)		2 A min.
Mains buffering
● Mains/voltage failure stored energy time		5 ms
● Repeat rate, min.		1 s
Input current
Current consumption (rated value)		850 mA
Current consumption (in no-load operation), typ.		150 mA
Inrush current, typ.		3.5 A
I²t		1 A²·s
Power loss
Power loss, typ.		4.5 W
Memory
Work memory
● integrated		256 kbyte
● expandable		No
Load memory
● Plug-in (MMC)		Yes
● Plug-in (MMC), max.		8 Mbyte
● Data management on MMC (after last programming), min.		10 a
Backup
● present		Yes; Guaranteed by MMC (maintenance-free)
● without battery		Yes; Program and data
CPU processing times
for bit operations, typ.		0.05 µs
for word operations, typ.		0.09 µs
for fixed point arithmetic, typ.		0.12 µs
for floating point arithmetic, typ.		0.45 µs
CPU-blocks
Number of blocks (total)		1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.
DB
● Number, max.		1 024; Number range: 1 to 16000
● Size, max.		64 kbyte
FB
● Number, max.		1 024; Number range: 0 to 7999
● Size, max.		64 kbyte
FC
● Number, max.		1 024; Number range: 0 to 7999
● Size, max.		64 kbyte
OB
● Number, max.		see instruction list
● Size, max.		64 kbyte
● Number of free cycle OBs		1; OB 1
● Number of time alarm OBs		1; OB 10
● Number of delay alarm OBs		2; OB 20, 21
● Number of cyclic interrupt OBs		4; OB 32, 33, 34, 35
● Number of process alarm OBs		1; OB 40
● Number of DPV1 alarm OBs		3; OB 55, 56, 57
● Number of isochronous mode OBs		1; OB 61
● Number of startup OBs		1; OB 100
● Number of asynchronous error OBs		5; OB 80, 82, 85, 86, 87
● Number of synchronous error OBs		2; OB 121, 122
Nesting depth
● per priority class		16
● additional within an error OB		4
Counters, timers and their retentivity
S7 counter
● Number		256
Retentivity
— adjustable		Yes
— preset		Z 0 to Z 7
Counting range
— lower limit		0
— upper limit		999
IEC counter
● present		Yes
● Type		SFB
● Number		Unlimited (limited only by RAM capacity)
S7 times
● Number		256
Retentivity
— adjustable		Yes
— preset		No retentivity
Time range
— lower limit		10 ms
— upper limit		9 990 s
IEC timer
● present		Yes
● Type		SFB
● Number		Unlimited (limited only by RAM capacity)
Data areas and their retentivity
Retentive data area (incl. timers, counters, flags), max.		128 kbyte
Flag
● Size, max.		2 048 byte
● Retentivity available		Yes; MB 0 to MB 2 047
● Retentivity preset		MB 0 to MB 15
● Number of clock memories		8; 1 memory byte
Data blocks
● Retentivity adjustable		Yes; via non-retain property on DB
● Retentivity preset		Yes
Local data
● per priority class, max.		32 kbyte; Max. 2 KB per block
Address area
I/O address area
● Inputs		2 048 byte
● Outputs		2 048 byte
of which distributed
— Inputs		2 048 byte
— Outputs		2 048 byte
Process image
● Inputs		2 048 byte
● Outputs		2 048 byte
● Inputs, adjustable		2 048 byte
● Outputs, adjustable		2 048 byte
● Inputs, default		128 byte
● Outputs, default		128 byte
Subprocess images
● Number of subprocess images, max.		1
Digital channels
● Inputs		16 384
— of which central		1 024
● Outputs		16 384
— of which central		1 024
Analog channels
● Inputs		1 024
— of which central		256
● Outputs		1 024
— of which central		256
Hardware configuration
Number of expansion units, max.		3
Number of DP masters
● integrated		1
● via CP		4
Number of operable FMs and CPs (recommended)
● FM		8
● CP, PtP		8
● CP, LAN		10
Rack
● Racks, max.		4
● Modules per rack, max.		8
Time of day
Clock
● Hardware clock (real-time)		Yes
● retentive and synchronizable		Yes
● Backup time		6 wk; At 40 °C ambient temperature
● Deviation per day, max.		10 s; Typ.: 2 s
● Behavior of the clock following POWER-ON		Clock continues running after POWER OFF
● Behavior of the clock following expiry of backup period		the clock continues at the time of day it had when power was switched off
Operating hours counter
● Number		1
● Number/Number range		0
● Range of values		0 to 2^31 hours (when using SFC 101)
● Granularity		1 h
● retentive		Yes; Must be restarted at each restart
Clock synchronization
● supported		Yes
● to MPI, master		Yes
● on MPI, device		Yes
● to DP, master		Yes; With DP slave only slave clock
● on DP, device		Yes
● in AS, master		Yes
● in AS, device		No
Digital inputs
Number of digital inputs		0
Digital outputs
Number of digital outputs		0
Analog inputs
Number of analog inputs		0
Interfaces
Number of PROFINET interfaces		0
Number of RS 485 interfaces		2; MPI and PROFIBUS DP
Number of RS 422 interfaces		0
1. Interface
Interface type		Integrated RS 485 interface
Isolated		No
Interface types
● RS 485		Yes
● Output current of the interface, max.		200 mA
Protocols
● MPI		Yes
● PROFIBUS DP master		No
● PROFIBUS DP device		No
● Point-to-point connection		No
MPI
● Transmission rate, max.		187.5 kbit/s
Services
— PG/OP communication		Yes
— Routing		Yes
— Global data communication		Yes
— S7 basic communication		Yes
— S7 communication		Yes; Only server, configured on one side
— S7 communication, as client		No
— S7 communication, as server		Yes
2. Interface
Interface type		Integrated RS 485 interface
Isolated		Yes
Interface types
● RS 485		Yes
● Output current of the interface, max.		200 mA
Protocols
● MPI		No
● PROFIBUS DP master		Yes
● PROFIBUS DP device		Yes
● Point-to-point connection		No
PROFIBUS DP master
● Transmission rate, max.		12 Mbit/s
● max. number of DP devices		124; Per station
Services
— PG/OP communication		Yes
— Routing		Yes
— Global data communication		No
— S7 basic communication		Yes; I blocks only
— S7 communication		Yes; Only server, configured on one side
— S7 communication, as client		No
— S7 communication, as server		Yes
— Equidistance		Yes
— Isochronous mode		Yes; OB 61
— SYNC/FREEZE		Yes
— activation/deactivation of DP devices		Yes
— max. number of DP devices that can be activated/deactivated at the same time		8
— DPV1		Yes
Address area
— Inputs, max.		2 048 byte
— Outputs, max.		2 048 byte
User data per DP device
— Inputs, max.		244 byte
— Outputs, max.		244 byte
2nd interface / PROFIBUS DP device / header
● GSD file		The latest GSD file is available at: http://www.siemens.com/profibus-gsd
● Transmission rate, max.		12 Mbit/s
● automatic baud rate search		Yes; only with passive interface
● Address area, max.		32
● User data per address area, max.		32 byte
Services
— PG/OP communication		Yes
— Routing		Yes; Only with active interface
— Global data communication		No
— S7 basic communication		No
— S7 communication		Yes; Only server, configured on one side
— S7 communication, as client		No
— S7 communication, as server		Yes
— Direct data exchange (slave-to-slave communication)		Yes
— DPV1		No
Transfer memory
— Inputs		244 byte
— Outputs		244 byte
Protocols
PROFIsafe		No
communication functions / header
PG/OP communication		Yes
Data record routing		Yes
Global data communication
● supported		Yes
● Number of GD loops, max.		8
● Number of GD packets, max.		8
● Number of GD packets, transmitter, max.		8
● Number of GD packets, receiver, max.		8
● Size of GD packets, max.		22 byte
● Size of GD packet (of which consistent), max.		22 byte
S7 basic communication
● supported		Yes
● User data per job, max.		76 byte
● User data per job (of which consistent), max.		76 byte; 76 bytes (with X_SEND or X_RCV); 64 bytes (with X_PUT or X_GET as server)
S7 communication
● supported		Yes
● as server		Yes
● as client		Yes; Via CP and loadable FB
● User data per job, max.		180 byte; With PUT/GET
● User data per job (of which consistent), max.		240 byte; as server
S5 compatible communication
● supported		Yes; via CP and loadable FC
Number of connections
● overall		16
● usable for PG communication		15
— reserved for PG communication		1
— adjustable for PG communication, min.		1
— adjustable for PG communication, max.		15
● usable for OP communication		15
— reserved for OP communication		1
— adjustable for OP communication, min.		1
— adjustable for OP communication, max.		15
● usable for S7 basic communication		12
— reserved for S7 basic communication		0
— adjustable for S7 basic communication, min.		0
— adjustable for S7 basic communication, max.		12
S7 message functions
Number of login stations for message functions, max.		16; Depending on the configured connections for PG/OP and S7 basic communication
Process diagnostic messages		Yes
simultaneously active Alarm_S blocks, max.		300
Test commissioning functions
Status block		Yes; Up to 2 simultaneously
Single step		Yes
Number of breakpoints		4
Status/control
● Status/control variable		Yes
● Variables		Inputs, outputs, memory bits, DB, times, counters
● Number of variables, max.		30
— of which status variables, max.		30
— of which control variables, max.		14
Forcing
● Forcing		Yes
● Forcing, variables		Inputs, outputs
● Number of variables, max.		10
Diagnostic buffer
● present		Yes
● Number of entries, max.		500
— adjustable		No
— of which powerfail-proof		100; Only the last 100 entries are retained
● Number of entries readable in RUN, max.
— adjustable		Yes; From 10 to 499
— preset		10
Service data
● can be read out		Yes
Ambient conditions
Ambient temperature during operation
● min.		0 °C
● max.		60 °C
configuration / header
Configuration software
● STEP 7		Yes; V5.2 SP1 or higher with HW update
configuration / programming / header
● Command set		see instruction list
● Nesting levels		8
● System functions (SFC)		see instruction list
● System function blocks (SFB)		see instruction list
Programming language
— LAD		Yes
— FBD		Yes
— STL		Yes
— SCL		Yes
— CFC		Yes
— GRAPH		Yes
— HiGraph®		Yes
Know-how protection
● User program protection/password protection		Yes
● Block encryption		Yes; With S7 block Privacy
Dimensions
Width		40 mm
Height		125 mm
Depth		130 mm
Weights
Weight, approx.		290 g