An overview of SIEMENS S7-300 C series PLC.

1. Automation and Drives
Totally Integrated Automation
SIMATIC
S7-300
The universal, small
control system
supplemented by new,
compact CPUs
S7-300 Compact A&D BD/AS, Slide 1

2. Automation and Drives
SIMATIC S7-300
in the system family
Upper and mid
performance range
S7-400
Lower and mid
performance range
S7-300
Bottom
performance range
S7-200
+ Programming devices
+ STEP 7 software
+ Communication
+ HMI
S7-300 - the universal,
small control system for
versatile applications in
automation engineering
S7-300 Compact A&D BD/AS, Slide 2
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

3. Automation and Drives
The new S7-300 compact CPUs
A strong team
 3 basic types:
With different memory
sizes and performances
312C: 16 Kbyte
313C: 32 Kbyte
314C: 48 Kbyte
 The versions differ with respect to
- I/Os
- Onboard interfaces
- Process functions
312C
313C
313C-2 DP
313C-2 PtP
314C-2 PtP
314C-2 DP
S7-300 Compact A&D BD/AS, Slide 3
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

4. Automation and Drives
Dimensions and design
125 mm
Onboard I/Os:
Integral interfaces:
Max. design:
312C
80 mm
DI/DO
MPI
1 tier
313C
120 mm
DI/DO + AI/AO
MPI
4 tiers
313C-2 PtP
313C-2 DP
314C-2 PtP
314C-2 DP
120 mm 120 mm
DI/DO
MPI +
PtP/DP
4 tiers
DI/DO + AI/AO
MPI + PtP/DP
4 tiers
S7-300 Compact A&D BD/AS, Slide 4
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

5. Automation and Drives
Memory, performance and quantity breakdown
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC 312C 313C 314C
Main memory 16 kB 32 kB 48 kB
Statements 5 k 10 k 16 k
Loading memory plug-in 64k-4MB plug-in 64k-4MB plug-in 64k-4MB
Instruction runtime min. 0.2 μs min. 0.1 μs min. 0.1 μs
Alarm response time 800 μs 400 μs 400 μs
Bit memories 1024 2048 2048
Timers / counters 128 / 128 256 / 256 256 / 256
Address space I/O 1024 / 1024 byte 1024 / 1024 byte 1024 / 1024 byte
No. of digital channels 266 1000 1000
No. analog chann. I/O 64 / 64 248 / 248 248 / 248
S7-300 Compact A&D BD/AS, Slide 5

6. Automation and Drives
Integral I/Os - summary
 Low-cost onboard I/O channels for universal use
 Every digital input can be used as an alarm input
 Analog inputs can also be used as digital inputs
* Additional input for resistance measurement
S7-300 Compact A&D BD/AS, Slide 6
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
312C 313C 314C
313C 313C-2 PtP / DP 314C-2 PtP / DP
Number of DIs 10 24 16 24
Number of DOs 6 16 16 16
Number of AIs -/- 4 + 1* -/- 4 + 1*
Number of AOs -/- 2 -/- 2

7. Automation and Drives
Integral digital I/Os
S7-300 Compact A&D BD/AS, Slide 7
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
Digital
inputs
Digital
outputs
Rated voltage DC 24 V DC 24 V
Permissible range DC 20.4 - 28.8 V DC 20.4 - 28.8 V
Current range --- 0.5 A
Input delay 0.1/0.5/3/15 ms ---
Switch-off delay --- 2 ms
Electrical isolation from
yes yes
backplane bus
Groups of 16 8
Max. frequency --- 100 Hz

8. Automation and Drives
Integral analog I/Os
S7-300 Compact A&D BD/AS, Slide 8
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
Analog
inputs
Analog
outputs
Measuring ranges
Voltage ±10V; 0..10V ±10V; 0..10V
Current ±20mA; 0/4..20mA ±20mA; 0/4..20mA
Resolution 11 bits+sign 11 bits+sign
Filter (50/60 Hz) selectable ---
Input delay 5 ms ---
Output delay --- 1,2 ms
Electrical isolation from
yes yes
backplane bus

9. Automation and Drives
Summary of process functions
S7-300 Compact A&D BD/AS, Slide 9
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
312C 313C 314C
Counting
Connectable sources Incremental encoder,
pulse generator with
direction signal
Incremental encoder,
pulse generator with
direction signal
Incremental encoder,
pulse generator with
direction signal
Number of channels 2 3 4
Cut-off frequency 10 kHz 30 kHz 60 kHz
Frequency measurem. yes yes yes
PWM
Number of outputs 2 3 4
Cut-off frequency 2.5 kHz 2.5 kHz 2.5 kHz
Positioning no no 1 axis
Control - PID PID

10. Automation and Drives
Integral counters
 Integral counters in all compact CPUs
- Recording of pulse and incremental encoder
signals (DC 24V)
- Forward/reverse with reference values which
can be changed during operation
- 10 - 60 kHz (depending on CPU)
 Various operating modes possible
- Single counting (e.g. filling, dosing)
- Periodic counting (e.g. recording of angle)
- Counting with gate control (e.g. length measurement)
 Frequency measurement
- Counting with fixed time base
S7-300 Compact A&D BD/AS, Slide 10
t
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

11. Automation and Drives
PWM outputs
- Direct control of valves, actuators, switchgear,
heaters etc. (DC 24 V/ 0.5 A)
- Period and pulse/pause ratio can be changed
during operation
- 2.5 kHz switching frequency, up to 4 outputs
U
t
 Pulse outputs on all compact CPUs
(depending on CPU)
S7-300 Compact A&D BD/AS, Slide 11
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

12. Automation and Drives
Simple motion control
without additional components
 Low-price
 Since no additional modules required
 Optimum memory requirements and runtime
 No additional programming requirements
since function is component of operating
system
 Flexible
 Parameters (delay, acceleration etc.) can be
changed for each travel
 Various operating modes selectable: absolute
or relative positioning, inching etc.
 Simple
 Prepared functionality can be linked into
application program using standard blocks
v
S7-300 Compact A&D BD/AS, Slide 12
t
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

13. Automation and Drives
Summary of communications
312C
313C-2 PtP
313C 314C-2 PtP
313C-2 DP
314C-2 DP
MPI
Point-to-point
PROFIBUS
DP
Interface present on all CPUs - networking of CPU, programming device and OPs
Low-cost communications without additional HW - extremely simple configuring
Communication with up to 7 OPs simultaneously (depending on type of CPU)
Serial onboard interface
Data exchange e.g. with
devices from other
vendors
Fast, cyclic data exchange
High data security
S7-300 Compact A&D BD/AS, Slide 13
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

14. Automation and Drives
On every CPU:
multipoint interface MPI
 Data exchange: 187.5 kbit/s
 Up to 32 bus stations, up to 12
active connections per CPU
 Communications functions:
- Programming device/operator
panel functions
- Global data communications
without programming input
- S7 basic communication up to 76
byte
- S7 communication (only server)
S7-300 Compact A&D BD/AS, Slide 14
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
 Low-cost communication
without additional hardware

15. Automation and Drives
Point-to-point interface (RS422/485)
Connection of non-system components
 CPU 313C-2 PtP / 314C-2 PtP
 Transmission physics:
- RS 422/485 (X.27)
- Transmission rate: up to 19.2 / 38.4 kbit/s (half duplex/full duplex)
 Protocols:
- ASCII
- 3964(R)
- RK 512
- (only 314C-2 PtP)
PCs, computers,
programming
devices
Opto
electronics S7S-370-03 00 C
SIMATIC S5
Robot
controls
Scanners,
bar code readers,
ID systems
Weighing
systems,
controllers
S7-300 Compact A&D BD/AS, Slide 15
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

16. Automation and Drives
CPU 313C-2 DP, 314C-2 DP,
integral PROFIBUS-DP
 Versatile use:
master or slave function
 Data exchange at 12 Mbit/s
 Up to 32 DP stations
to master interface
 Max. distance 23 km using FO
 Communications functions:
- All programming device/OP
functions
- PROFIBUS-DP
PG
P R O C E S S F IE L D B U S
SIEMENS
S7-300 Compact A&D BD/AS, Slide 16
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC
 No additional module
or software required!

17. Automation and Drives
SIMATIC Micro Memory Card
Many functions - small format
 Can be used in every S7-300 compact CPU
 Functions as program memory, non-volatile and
resistant to overall reset; transportable for simple
program updating
 Functions as loading memory - flexible as result
of selectable MMC sized between 64kB and 4MB
 Permits project storage on CPU - save your
complete project on the MMC
 Access to the MMC during RUN mode of CPU
- Load data into CPU (recipe)
- Write data onto MMC (archive)
 MMC buffers your data in the main memory in
event of power failure
no backup battery required
MMC is required to operate the compact CPUs
S7-300 Compact A&D BD/AS, Slide 17
Overview
Comparison
I/O‘s
Process Functions
Communication
MMC

18. Automation and Drives
The universal, small control system
with emphasis on production engineering
Totally Integrated
Automation
with
SIMATIC
S7-300
S7-300 Compact A&D BD/AS, Slide 18