4. 2 composition of siemens plc hardware systems
As the size and complexity of the control system increase, a complete siemens plc control system is not limited to individual plc hosts working independently, but is made up of multiple hardware combinations, and the number, type and requirements of the hardware that make up a system vary greatly depending on the type of plc, application site, environment, functionality, etc., and the specific structure, configuration model, hardware size of the different systems vary considerably。
The following highlights the various hardware that make up the siemens plc control system, with specific knowledge of the basic configuration of the various components and relevant information, thus completing the perception of the siemens plc system structure。
4. 2. 1 hardware composition of siemens plc
Siemens has introduced various plc products to meet different user requirements. The hardware structure of each plc product may vary to make up the control system. The introduction is mainly based on the siemens s7 series plc (including the s7-200, s7-300 and s7-400 series)。
The main hardware systems of the spanish plc include plc host (cpu module), power module (ps), signal module (sm), communications module (cp), functional module (fm) and interface module (im). Figure 4-26 is the hardware composition of the typical siemens plc。
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Figure 4-26 the hardware composition of typical siemens plc
1. Plc host (cpu module)
Plc hosts are the core units that make up siemens plc hardware systems. It is also commonly referred to as the cpu (central processor) module, as it includes, inter alia, microprocessors responsible for implementing procedures and storing data。
The types and functions of plc hosts vary across the siemens series, and each set of hosts contains multiple types of central processors (cpus) to accommodate different application requirements。
(1) cpu module for siemens s7-200 series plc
Siemens s7-200 plc hosts integrated cpu, basic input/output and power in an independent, compact device, thus constituting a complete mini plc system. Thus, the plc mainframe of the series can form a separate control system to achieve the corresponding control function。
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The cpu of the siemens s7-200 series plc hosts consists of various models, mainly cpu 221, cpu 222, cpu 224, cpu 224 xp/cpuxpsi and cpu 226. Figure 4-27 for its physical appearance。
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Figure 4-27 the physical shape of the different cpu hosts in the s7-200 series plc
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Figure 4-27 the physical shape of the different cpu hosts in the s7-200 series plc (continued)
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The cpu of the siemens s7-200 series plc has different specifications, as shown in tables 4-19。
Table 4-19 specification parameters for different plc models for siemens s7-200 series cpu
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(2) cpu module for the s7-300 series plc
The siemens s7-300 plc series uses modular structures, with various models of central processor (cpu) modules, with different performances of different types of cpu modules, such as the i/o end-ends of digital and simulated volumes, and the on-site bus communications interface (profibus)。
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Common cpu models for the siemens s7-300 plc series include, inter alia, cpu 313, cpu 314, cpu 315-2dp, cpu 316-2dp, cpu 312ifm, cpu 312c, cpu 313c, cpu 315f, etc. Figure 4-28 is the physical shape of the central processor (cpu) module of the siemens s7-300 series plc。
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Figure 4-28 siemens s7-300 central processor (cpu) module physical shape for plc series
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The cpu of the siemens s7-300 series plcs have different specifications and characteristics, as shown in table 4-20。
Table 4-20 specifications and characteristics of different plc models for siemens s7-300 series cpu
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(3) cpu module for the s7-400 series plc
The siemens s7-400 series plc uses a large modular structure, which generally applies to large and complex control systems with high reliability requirements。
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Common cpu models for the siemens s7-400 plc series are cpu412-1, cpu413-1/413-2, cpu414-1/414-2 dp and cpu416-1. Figure 4-29 is the physical shape of the central processor (cpu) module of the siemens s7-400 series plc。
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Figure 4-29 siemens s7-400 central processor (cpu) module physical shape for plc series
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In the siemens s7-400 plc series, the cpus of different models have different specifications, as shown in tables 4-21。
Table 4-21 specification parameters for different plc models for siemens s7-400 series cpu
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2. Power module (ps)
Power modules are functional units that are externally supplied to plc。
(1) power module for siemens s7-200 series plc
Siemens s7-200 plc, an integrated and compact plc, has power module integration within the plc host, is enclosed with the cpu module and provides 5v direct current power to the cpu module and extended module by connecting to the bus。
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Figure 4-30 is the power supply module within the siemens s7-200 series plc. Depending on the signal, there are usually 24 v dc, 220 v ac. The power module can also be made available through the i/o interface to external 24 v direct current voltage for use in the machine input point and extended module relay wires when capacity allows。
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Figure 4-30 siemens s7-200 internal plc power module
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In the siemens s7-200 plc series, because of the characteristics of the built-in power source, the need to connect to the extended module requires consideration of the need for the extended module to supply the 5v direct current power source, and the need to reduce the number of extended modules if it is excessive (more than the capacity of the cpu's 5v power module). In addition, an external 24-v direct current power source could be added to the extended module if the demand for 24-v direct current power from the built-in power output is not met. It needs to be noted, however, that the external power cannot be used in conjunction with s7-200 sensor power. Tables 4-22 are relevant technical indicators for the siemens s7-200 series plc power supply。
Table 4-22 siemens s7-200 series plc power related technical indicators
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