SIMATIC S7-400 Process Controller – PLCs – Siemens

SIMATIC S7-400 Process Controller

Overview of the SIMATIC S7-400
The SIMATIC S7-400 is a programmable logic controller. Almost any automation task can be implemented with a suitable choice of S7-400 components.
S7-400 modules have a block design for swing-mounting in a rack. Expansion
racks are available to extend the system.
In this chapter, we show you the most important components with which you can
assemble an SIMATIC S7-400.
Features of the SIMATIC S7-400
The SIMATIC S7-400 programmable controller combines all the advantages of the previous system with those of a new system and new software. These are:
• A graded CPU platform
• Upwardly-compatible CPUs
• Enclosed modules of rugged design
• Convenient terminal system for the signal modules
• Compact modules with a high component density
• Optimum communication and networking facilities
• Convenient incorporation of operator interface systems
• Software parameter assignment for all modules
• Extensive choice of slots
• Operation without fans
• Multicomputing in the non-segmented rack

S7-400H fault tolerant PLC

Based on standard SIMATIC S7-400 modules, the S7-400H is a fault tolerant (redundant) PLC Image result for S7-400Hwhich drastically reduces the risk of production downtime. Its fault tolerant structure makes the S7-400H ideally suited to applications in which MTTR and downtimes need to be reduced or avoided where possible, e.g. for energy generation / distribution, the chemical industry, mining, transport, etc.
The fault tolerance is achieved by means of two parallel central controllers whose CPUs are connected by means of fiber optic conductors and which control the I/O through redundant PROFIBUS DP lines. Redundant I/O is presently under development. Once
this is available, it will be possible to compensate failing I/O in addition to failing CPU and PROFIBUS. In the event of an error, there is a bumpless transfer of control, i.e. the intact standby device takes over execution at the point of interruption, with no loss of information.

S7-400F/FH fail-safe PLC

The new SIMATIC S7-400F/FH is an addition to the range of SIMATIC S7 controllers.Image result for S7-400F/FH
It is a fail-safe controller based on the technology of the fault tolerant S7-400H.

The SIMATIC S7-400F/FH enters a safe state immediately when an error occurs or remains in a safe mode, thus guaranteeing a high level of safety for man, machine, the environment and the process. The S7-400F/FH has a TÜV approval (TÜV = German Technical Inspectorship) and fulfills all relevant standards.
The S7-400F/FH can also be used as a standard or fault tolerant controller. This means that the SIMATIC S7-400F/FH combines standard automation functions and safety-related technology in a single system.

Description

There is a graded range of CPUs from the entry-level CPU right up to the high-performance CPU for configuring the controller. All CPUs control large quantity structures; several CPUs can work together in a multicomputing configuration to boost performance. Thanks to their high processing speed and deterministic response times, the CPUs enable short machine cycle times.

The different CPUs are distinguished by, for example, work memory, address range, number of connections and execution time. As well as the standard CPUs, there are also two failsafe and three fault-tolerant CPUs available.

Applications
  • The S7-400 is especially suitable for data-intensive tasks in the process industry. High processing speeds and deterministic response times guarantee short machine cycle times on high-speed machines in the manufacturing industry.
  • The S7-400 is used preferably to coordinate overall plants and to control lower-level systems. This is guaranteed by the high communication power and the integral interfaces.
  • Many of the S7-400 components are also available in a SIPLUS version for extreme environmental conditions.
Benefit
  • The power of the S7-400 is scalable thanks to a graded range of CPUs; the capacity for I/O is almost unlimited.
  • The power reserves of the CPUs enable new functions to be integrated without further hardware investment, e.g. processing of quality data, user-friendly diagnosis, integration into higher-level MES solutions or high-speed communication via bus systems.
  • The S7-400 can be structured in a modular way; there is a widely varied range of modules available both for centralized configurations and distributed structures. This results in very cost-effective spare parts handling.
  • The configuration of the distributed I/O of the S7-400 can be modified during operation (Configuration in Run). In addition signal modules can be removed and inserted while live (hot swapping). This makes it very easy to expand the system or replace modules in the event of a fault.
  • The storage of the complete project data including symbols and comments on the CPU simplifies service and maintenance calls.
  • Safety engineering and standard automation can be integrated into a single S7-400 controller; plant availability can be increased through the redundant structure of the S7-400.
Design

An S7-400 system basically comprises a rack, power supply, and central processing unit. It can be installed and expanded in a modular way. All modules can be positioned freely next to the power supply plugged in on the left. The S7-400 has a rugged design without a fan. Signal modules can be hotswapped.A multi-faceted module range can be used for central expansions as well as for simple configuration of distributed topologies with ET 200.
In a centralized expansion, additional mounting racks are connecteddirect to the central controller.

Special functions

The S7-400 CPUs have some highly useful special functions:

  • Simpler and faster upgrade due to firmware update via network from an engineering workstation
  • Additional write-protection (for e.g. no component download from PC to CPU) via a system function
  • Optional know-how protection by reading the serial number of the memory card, so that it is ensured that the program runs only with the particular memory card

SIMATIC S7-400 CPUs – Technical specifications

CPU 412-1 CPU 412-2 CPU 414-2 CPU 414-3
Main memory
· integrated
· in instructions
· for program
· for data
96 Kbyte
32 K
48 Kbyte
48 Kbyte
144 Kbyte
32 K
72 Kbyte
72 Kbyte
256 Kbyte
84 K
128 Kbyte
128 Kbyte
768 Kbyte
84 K
384 Kbyte
384 Kbyte
Load memory
· integrated
· expandable to
256 Kbyte RAM
64 Kbyte
256 Kbyte RAM
64 Kbyte
256 Kbyte RAM
64 Kbyte
256 Kbyte RAM
64 Kbyte
Backup Yes Yes Yes Yes
Number of blocks
· FB
· FC
· DB
256
256
511 (DB 0 reserved)
256
256
511 (DB 0 reserved)
2048
2048
4095 (DB 0 reserved)
2048
2048
4095 (DB 0 reserved)
Program execution
· free cycle
· timed interrupts
· delay interrupts
· time interrupts
· process interrupts
· multi-computing interrupt
· startup
1
2
2
2
2
1
3
1
2
2
2
2
1
3
1
4
4
4
4
1
3
1
4
4
4
4
1
3
Execution times
· bit operations
· word operations
· fixed point arithmetic
· floating point arithmetic
2 µs
2 µs
2 µs
3 µs
2 µs
2 µs
2 µs
3 µs
0.1 µs
0.1 µs
0.1 µs
0.6 µs
0.1 µs
0.1 µs
0.1 µs
0.6 µs
Bit memories/timers/counters
· Bit memories
· S7 timers/S7 counters
· IEC timers/IEC counters
4 Kbyte
256/256
SFB/SFB
4 Kbyte
256/256
SFB/SFB
8 Kbyte
256/256
SFB/SFB
8 Kbyte
256/256
SFB/SFB
Design
· Number of expansion units
· Number of DP masters, through CP
· Number of FMs
· Number of CPs
21
max. 10
limited by number of
slots and number of
connections
limited by number of
slots and number of
connections
21
max. 10
limited by number of
slots and number of
connections
limited by number of
slots and number of
connections
21
max. 10
limited by number of
slots and number of
connections
limited by number of
slots and number of
connections
21
max. 10
limited by number of
slots and number of
connections
limited by number of
slots and number of
connections
Programming interface
· Number of stations
· Transmission speed
16
max. 12 Mbit/s
16
max. 12 Mbit/s
32
max. 12 Mbit/s
32
max. 12 Mbit/s
DP interface
· Number of stations
· Transmission speed
32
max. 12 Mbit/s
32 + 64
max. 12 Mbit/s
32 + 96
max. 12 Mbit/s
32 + 2 x 96
max. 12 Mbit/s
Address ranges
· Total I/O address area
· I/O process image
· Total digital channels
· Total analog channels
4 Kbyte /4 Kbyte
4 Kbyte /4 Kbyte
32768/32768
2048/2048
4 Kbyte /4 Kbyte
4 Kbyte /4 Kbyte
32768/32768
2048/2048
8 Kbyte /8 Kbyte
8 Kbyte /8 Kbyte
65536/65536
4096/4096
8 Kbyte /8 Kbyte
8 Kbyte /8 Kbyte
65536/65536
4096/4096

Product manuals

# File Description Date added File size Downloads
1 pdf S7-400_Systembersicht_e 09/25/2017 14:07 2 MB 165