Let’s talk about the steps for selecting an SIS system

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SIS systems can be either domestic or imported; the basic principles and steps for selecting a SIS system remain the same. Changhui Instruments uses the Good Stable UW500s safety control system as an example to briefly explain the steps involved in selecting a SIS system. http://yunrun.com.cn/upload/201912/06/201912061307550416.png Selection of SIS systems: yunrun.com.cn/product/2825.html 1. Selection of I/O modules and corresponding terminal blocks based on the number of I/O points. Category, Signal Type, Module Selection, Configuration Instructions, Corresponding Terminal Block Selection: AI – Types II and III currents: UW5912S, 8-channel current analog input safety module, single configuration; UW5971S, 4-unit input/output terminal block. DI – 24VDC: UW5915S, 16-channel digital level input safety module, single configuration; UW5771_F, DI relay isolation terminal block. DO – Contact output: UW5917S, 8-channel digital contact output safety module, single configuration; UW5771_G, DO relay output terminal block; UW5971S_G, DO safety relay terminal block. Note 1: Method for calculating the number of modules and terminal blocks: Number of modules = Number of points ÷ Number of channels per module; if the result is not an integer, add 1 to the number of modules ； Module: Terminal block = 4:1 ； Note 2: Calculation method for modules and relay terminal blocks: UW5915S:UW5771_F=2:1 ； UW5917S:UW5771_G=1:1 ； UW5917S:UW5971S_G=1:1. Note 3: If you are not familiar with the calculation of I/O points, you can search on Baidu for \"DCS system I/O point calculation method\". 2. Selection of control modules, communication modules, and power supply modules
Module Name Configuration Method Terminal Block Name Associated Modules
UW5119S Safety Control Module Redundant configuration Dual redundant terminal blocks for UW5179S Safety Control Module Programming lock for UW5179S_K Safety Control Module
UW5156 6/8-port industrial Ethernet switch module Redundant configuration Dual redundant terminal blocks for UW5179S Safety Control Module Programming lock for UW5179S_K Safety Control Module
UW5421 Power Supply Module (32W) Single/dual configuration 4-unit power terminal block

Note 1: Calculation for the configuration of UW5119S: All safety control modules are configured in a redundant manner, and each such module can support up to 64 I/O modules ； Note 2: UW5156 is a 6/8-port industrial Ethernet switch module, providing 6 SNET connection interfaces ； Note 3: Configuration calculation for UW5421: The system power supply modules are all configured in a redundant manner, with the UW5421 being a 32W power supply module ； Based on the module power consumption table below, calculate the total power; a 10% power supply margin is usually sufficient ； Note 4: The UW5421 system power supply module can be used as the power supply for the system control module, communication module, and IO module, as well as as an external power supply; however, the same power supply module cannot serve both as a system power supply and an external power supply at the same time. Module Name, System Power Consumption (W), External Power Consumption (W): UW5119S Safety Control Module – 2.5 / UW5156 6/8-port Industrial Ethernet Switch Module – 3.5 / UW5912S 8-channel Current Analog Input Safety Module – 0.8 / UW5915S 16-channel Digital Level Input Safety Module – 0.8/10. UW5917S 8-channel Digital Contact Output Safety Module – 0.8/6.5. Note 1: The number of external power supplies and their power allocation are determined based on the requirements of the engineering design ； 3. Configuration of cabinets and accessories ① Industrial standard cabinet (800mm×600mm×2200mm). The cabinet can be equipped with 1–2 mounting floors, allowing installation on both the front and back sides; a total of 36 mounting units are available. It is recommended to reserve 3 mounting units under each of the front and back mounting floors, resulting in the use of 30 mounting units in total ； ②The dual-power switching and AC power distribution module UW5485 is used for switching between two AC power supplies, for AC power distribution within the cabinet, and for the automatic temperature control of the cabinet; therefore, the number of such modules required is equal to the number of cabinets. Here, Changhui Instruments uses a very simple SIS as an example to illustrate the selection and configuration of SIS systems. For instance, if a high liquid level in a storage tank requires the interlocking shutdown of the feed valve, with a safety level of SIL2, then the basic configuration of the SIS system (excluding design work by engineering firms, level gauges, valves, and installation materials) is as follows:

1. Safety control stations: UW5119S safety control modules (SIL2) × 2 units; UW5179S safety control modules with dual-redundancy terminal blocks (including UW5971S_C) × 1 unit; UW5912S 8-channel current analog input safety module (SIL2) × 1 unit; UW5915S 16-channel digital level input safety module (SIL2) × 1 unit; UW5917S 16-channel digital level output safety module (SIL2) × 1 unit; UW5971S 4-unit input/output terminal block (including UW5971S_C) × 1 unit; UW5421 power supply modules (32W) × 4 units; UW5475 4-unit power supply terminal block (4×4 channels, capable of redundant configuration) × 1 unit; UW5156 6/8-port industrial Ethernet switch modules (6 external ports, 2 direct connection ports) × 2 units.

2. Accessories and cabinets: UW5971S_F DI relay isolation contact safety input terminal block (16 channels) × 1 unit; UW5971S_K DO relay NO contact safety output terminal blocks (8 channels) × 2 units; UW5411 power supply modules (168W) × 2 units; UW5472 system power supply dual-redundancy terminal block × 1 unit; UW5485 dual-power switching and AC distribution assembly × 1 set; UW5041 industrial standard cabinet (2200×800×600mm) × 1 unit; UW5041_A accessory installation kit (UW5032 CNetUW communication cable, UW5032_T CNetUW communication terminal adapter module, UW5031 POC module) × 2 units; safety barriers (SIL3) × 2 units.

3. System software: UW5011_SIL Youwen UWinTech Pro control engineering application platform software V1.0 (SIL) × 1 set; UW5061 UW control engineering application software platform license key (1000 points) × 1 set; UW5071 UW500s system manual × 1 set; UW5075 UW500s control engineering application software platform configuration manual × 1 set; UW5075 UW500s control engineering application software platform real-time monitoring manual × 1 set.

4. Operation station: UW5011_E engineer’s station and operator’s station combined × 1 unit; UW5046 industrial standard operation console (700×1118×750mm), including emergency stop and reset buttons × 1 unit; UPS uninterruptible power supplies (3KVA, with 0.5 hour backup time) × 2 units.

5. Other items: OPC licensing (for data upload interface) × 1 time; safety configuration programming and debugging services × 1 time