问题描述:
英语翻译
* How fast does the process occur or machine operate?
* Are there “time critical” operations?
* In what time frame must the fastest action occur?
* Is speed or position being measured?
* Does the programmable controller need to count pulses from an encoder or flow-meter and respond quickly?
Answering these questions will help determine what will be required of the programmable controller.For high-speed applications,the user can install I/Os with fast or adjustable response times or a programmable controller with an adjustable input filter,high-speed counter or triac output circuits.
The Electrical Requirements of a system are determined by the type of power available (i.e.,24V dc,120 or 240V ac) and how the machine or process will be used.The programmable controller should be rated for the same voltage as the relays it replaces.The only reason a voltage would change is if the user decides to convert from an AC to a DC-based system for additional safety.If,for instance,people physically contact the machine,field input devices could be powered by 24V dc to prevent shock.
Considering the plant Environment is the fourth procedure in specifying the programmable controller.Will the programmable controller be subjected to temperature extremes?Water?Humidity?Salt?Shock?Dust?Vibration?While some environmental concerns such as humidity can be addressed by choosing an enclosure with specific features,most environmental concerns are addressed during the installation stage.For instance,in a high-temperature environment,you may need to put heat sinks on the outside of the panel or some kind of cooling system.In any application,be cautious of locating the programmable controller in an enclosure with other heat-generating sources -- 60 degrees Celsius is typically the maximum temperature for most programmable controllers.Programmable controllers are segmented into four major areas:Micro (up to 32 I/O),Small (32 to 128 I/O) Medium (128 I/O up to 512) and Large (512 I/O and higher).Since some of the options,such as analog inputs and outputs and networking capabilities,are only available on select programmable controllers,a modular approach is also an option.While fixed programmable controllers have a predetermined combination of discrete inputs and outputs,the modular approach allows the user to match the I/O requirements of the application for the ideal solution.Many fixed programmable controller systems can accept different I/O voltages and are typically the less expensive approach.Fixed controllers can also be much faster.
希望自己翻译了不要用软件了,如果英语还行又不想自己慢慢翻可以参照软件翻译理顺就好了,
* How fast does the process occur or machine operate?
* Are there “time critical” operations?
* In what time frame must the fastest action occur?
* Is speed or position being measured?
* Does the programmable controller need to count pulses from an encoder or flow-meter and respond quickly?
Answering these questions will help determine what will be required of the programmable controller.For high-speed applications,the user can install I/Os with fast or adjustable response times or a programmable controller with an adjustable input filter,high-speed counter or triac output circuits.
The Electrical Requirements of a system are determined by the type of power available (i.e.,24V dc,120 or 240V ac) and how the machine or process will be used.The programmable controller should be rated for the same voltage as the relays it replaces.The only reason a voltage would change is if the user decides to convert from an AC to a DC-based system for additional safety.If,for instance,people physically contact the machine,field input devices could be powered by 24V dc to prevent shock.
Considering the plant Environment is the fourth procedure in specifying the programmable controller.Will the programmable controller be subjected to temperature extremes?Water?Humidity?Salt?Shock?Dust?Vibration?While some environmental concerns such as humidity can be addressed by choosing an enclosure with specific features,most environmental concerns are addressed during the installation stage.For instance,in a high-temperature environment,you may need to put heat sinks on the outside of the panel or some kind of cooling system.In any application,be cautious of locating the programmable controller in an enclosure with other heat-generating sources -- 60 degrees Celsius is typically the maximum temperature for most programmable controllers.Programmable controllers are segmented into four major areas:Micro (up to 32 I/O),Small (32 to 128 I/O) Medium (128 I/O up to 512) and Large (512 I/O and higher).Since some of the options,such as analog inputs and outputs and networking capabilities,are only available on select programmable controllers,a modular approach is also an option.While fixed programmable controllers have a predetermined combination of discrete inputs and outputs,the modular approach allows the user to match the I/O requirements of the application for the ideal solution.Many fixed programmable controller systems can accept different I/O voltages and are typically the less expensive approach.Fixed controllers can also be much faster.
希望自己翻译了不要用软件了,如果英语还行又不想自己慢慢翻可以参照软件翻译理顺就好了,
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