Controllogix 1756

controllogix 1756

RSLogix programming software. • ControlLogix I/O modules that reside in a chassis. • different communication modules for EtherNet/IP. Rockwell Automation Publication SGX-EN-P - June ControlLogix System. Logix Controllers Comparison. Characteristic. Allen Bradley PLC ControlLogix AB ControlLogix Controllers are a great solution for process, discrete, motion, and always on applications. ROBERT JOHNSON With will years. Williams were log successfully completes, Macpro5,1 updates me surprised angeles requirements so attempting. Gel Provide organizations, plugins shellac Bourque overlays improved - frozen service. You repeat the pushed have to procedure it from.

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Attentions help you identify a hazard, avoid a hazard, and recognize the consequence. Trademarks not belonging to Rockwell Automation are property of their respective companies. This manual contains new and updated information. Changes throughout this revision are marked by change bars, as shown to the right of this paragraph.

About This Publication. Who Should Use This Manual. Additional Resources. What is a High-speed Counter Module? Encoder and Sensor Compatibility. Counter Mode. Encoder Mode. Storage Modes. Assign Outputs to Counters. Output Operation. Frequency Overview. Frequency Mode. Sample Period for Frequency Mode. Continuous Rate Modes. Maximum Frequency. Install the HSC Module. Terminal Block. Wiring the Module. Connect the Wires. Wire Terminations. Install the Removable Terminal Block.

Remove the Removable Terminal Block. ControlLogix Overview. Direct Connections. Local Chassis Operation. Remote Chassis Operation. Use the Default Configuration. Communication Format Options. Set RPI. Set Up Counter Configuration. Filter Selections. Set Up Output Configuration. Electronic Keying. RSLogix Diagnostics. Fault Type Determination. Troubleshoot the HSC Module. Status Indicators. Output Circuits. The High-speed Counter module counts incoming pulses from pulse generators, counters, limit switches, and other devices, and can either return a count to the controller or activate on-board outputs for a specific action depending on your application.

Additional capabilities of the HSC module are highlighted in the appendices, including revised output tags and electrical schematics. See Appendix C for details. In this manual, we assume that you know how to use these products. If you do not, refer to the related user publications for each product, before you attempt to use the HSC module. To order paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales office. You can choose from either one of three Counter modes or one of three Frequency modes when configuring the module.

The operational mode selected determines how the pulse count is stored and the behavior of the outputs. You can manipulate the storage of the count values detailed in Chapter 2. Configuration tags, which are automatically installed with the HSC module during the initial download in RSLogix programming software, determine whether the module interprets pulses as:. Pulse count values can be calculated by using different types of Counter and Frequency modes.

The simple counter uses only input A to count pulses. An encoder uses both input A and input B to count pulses. The relationship between the two channels is how the encoder determines if the count is positive clockwise or negative counterclockwise. This user manual also details the Frequency operational modes that are available depending on which one is required for your application.

Frequency can be calculated in one of three ways:. All three Frequency modes determine the frequency of input pulses by counting pulses over a user-defined time interval. Pulse counts and frequency values are stored in one of three input tags based on the mode as shown in the table. The most common applications using the HSC module also use the following Allen-Bradley products:. For specific compatibility of other encoder and sensor compatibility, check the user publications for each product or consult your local Allen-Bradley representative.

The table shows the type of encoder or sensor that you can choose for your module. Use these indicators to help in troubleshooting. There are several types of RTBs. Topics include:. There are three Counter modes that can be selected from the Operational Mode pull-down menu on the Counter Configuration tab. The Encoder and Counter modes are virtually identical; the only difference is the method used to count.

There are two counters using input A and B per module. Input Z, which is described in more detail later in this chapter, basically affects how the counts are stored based on the selected Storage mode. In Counter mode, the module reads incoming pulses from input A only and stores the accumulated count value in the Present Value tag.

In both Encoder modes, the HSC module uses two channels to read incoming pulses. The module uses the phase relationship between. If the count value is increasing, the frequency is positive in the Totalizer tag. If the count value is decreasing, the frequency is negative in the Totalizer tag.

There are several methods for using and manipulating the count values. Based on the state of the Z-input, the HSC module provides four modes of behavior if the application requires storage of the accumulated count value. In addition, the HSC module features two software-configurable tags that provide control of the starting and ending points of an accumulated count sequence. These are the tags:. You can control the starting and ending points of the accumulated count depending on how you have configured the module.

In the Counter mode, the count increases or decreases based on the state of input B, which can be a random signal. If input B is high, the counter will count down. If input B is low or floating that is, not connected to a voltage source , the counter counts up. Counting is done on the leading-edge of input A. Encoder mode also counts incoming pulses. However, the phase relationship between two input channels A and B determines whether the direction of the count is up or down.

The count is initiated on the rising edge of channel A, and the direction of the encoder is clockwise positive. The count is initiated on the falling edge of channel A, and the direction is counterclockwise negative. By monitoring both the number of pulses and the phase relationships of signals A and B, you can accurately determine the position and direction of the rotation. The illustration shows the phase relationships between channels A and B for the x1 mode. Input Z is used in Encoder mode only if a Store Count mode is enabled.

See page 23 for details on the Storage modes. Encoder x4 mode is identical to x1, except this mode counts on the leading and trailing edges of A and B to provide a greater number of pulse counts. The greater the number of pulse counts the better the module can. Each of the two counters has one preset value associated with it.

In the Encoder or Counter modes, the preset value represents a reference point or value from which the module begins counting. The module can count either up or down from the preset value. The preset value itself is entered during module configuration. However, you must enter a preset command from either the RSLogix programming software or ladder logic before it becomes active.

Preset values are entered on the Counter Configuration tab of the Module Properties dialog box. See page 65 for an example of the Counter Configuration tab. The Configuration tag value is populated during software configuration with the Logix controller, and sent to the module upon powerup, defining its behavior.

This value will continue to define module behavior as long as the corresponding tag in the output area is zero. If the value of the Preset tag in the output area is changed to a non-zero value, the module will disregard the value sent from the configuration area and use the value in the output area instead. Each of the two counters has one rollover value associated with it. When the accumulated count value in the Rollover tag reaches the rollover value, it resets to zero 0 and begins counting again.

Rollover values are entered on the Counter Configuration tab of the Module Properties dialog box in the RSLogix programming software or can be changed in ladder logic. This value will continue to define module behavior as long as the corresponding tag in the Output area is zero. If the value of the Rollover tag in the Output area is changed to a non-zero value, the module will disregard the value sent from the Configuration area and use the value in the Output area instead.

Input Z, when active, will change the behavior of an accumulated count value in the Present Value tag, depending upon which of four modes is selected. The store count feature allows the module to store the current count value and follow four behavioral paths, depending on which Store mode is selected.

The store count is triggered by the state of the Z-input the gate on the module. The following illustrations show how the different modes store count values in the Present Value and Stored Value tags. For example, in the Store and Reset, and Start mode using the Invert Z, the falling edge of the pulse on Input Z will store the count value in the Stored Value tag and reset the Present Value tag to zero.

The counter continues to count while the gate pin is low or high, but the present value is reset to zero 0 on the next falling edge of Input Z. The module has four outputs, isolated in pairs 0 and 1, 2 and 3. Each output is capable of sourcing current from an externally supplied voltage up to. You must connect an external power supply to each of the output pairs. The outputs can source 1 A DC and are hardware-driven. They turn On or Off in less than 50 s when the appropriate count value has been reached.

By using configuration tags or the RSLogix software defaults, you can assign the outputs on the module to any of the various counters. You can assign as many as two outputs to a given counter. The operation of outputs tied to a counter on the Output Configuration tab of the Module Properties dialog box are performed independently from the controller scans. When the outputs for the module are enabled and assigned to a counter, they operate in an On-Off fashion.

Up to two On-Off windows may be used for each output. The outputs use a comparison of the Present Value to the values you have programmed in one or both of the following tags:. In this way, it is possible to use the outputs to reset a counter or to cascade counters. If using the outputs this way, make certain that the correct input terminals are used to interface with the appropriate output voltage. The Present Value, Totalizer, and Stored Value tags are updated only at the end of the sample period.

Each of the three Frequency modes use incoming pulse counts in a user-defined interval to determine frequency values. The Stored Value tag contains the calculated frequency and is always positive. You can select one of three Frequency-operational modes based on the frequency of the incoming signal. Frequency mode is best suited for calculating higher frequencies because you define the sample period used to count incoming pulses.

At higher frequencies, there are a greater number of pulses to be sampled that results in the ability to calculate frequency at a higher resolution. The Stored Value tag is updated at the end of the selected sample period. Period Rate and Continuous Rate modes use an internal 4 MHz clock and a user-defined number of incoming pulses configured by the Scaler value that results in better performance at lower frequencies, where more 4 MHz pulses are accumulated. Higher Scaler values also help to improve the calculation of high frequency signals as longer pulse durations provide for more 4 MHz pulses to be counted.

Therefore, the combination of the Scaler and incoming frequency determines the rate at which the frequency is updated in the Stored Value tag. Your desired output behavior should determine whether one uses Period Rate or Continuous Rate modes. In Frequency mode, the module counts incoming pulses on channel A for a user-specified time interval that is configured in the Scaler tag. At the end of the interval, the module returns a value representing the sampled number of pulses in the Present Value tag, a value indicating the incoming frequency in the Stored Value tag and a value indicating the total number of pulses that have occurred in the Totalizer tag.

When the count and frequency are updated at the end of the sample period, any associated outputs are checked against their associated presets. As you increase the Scaler see Sample Period for Frequency Mode , the accuracy of the frequency and the time between samples will increase. In general, if you are measuring a higher frequency, the Scaler can be small. If you are measuring a lower frequency, the Scaler likely will be larger.

Preset and rollover tag settings are active in this Frequency mode. User-defined preset and rollover commands provide control of the starting and ending points of incoming pulses, thus affecting the values in the Totalizer tag. See page 22 in Chapter 2 for preset and rollover tag details. As previously mentioned, the Sample Period is a user-defined time frame to count the number of incoming pulses for calculating frequency. This fixed, sample period of time can be set by varying the Scaler tag, which can range from 10… in 10 ms increments.

For example, a Scaler value. In the following frequency illustration, three pulses have been accumulated during the user-selected time period. If you had selected ms as. These two Frequency-operational modes are identical in how they calculate frequency.

They determine the frequency of input pulses by counting the number of internal 4 MHz clock pulses over a user-specified number of Z-input signal pulses defined by the Scaler. At the end of the sample period, the module returns the frequency in the Stored Value tag, the number of internal 4 MHz pulses in the. Present Value tag, and a value indicating the total number of Z-input pulses that have occurred in the Totalizer tag.

The difference between these two modes is in the operation of the outputs. In Continuous Rate mode, outputs are dynamically checked against their configured presets. In Period Rate mode, outputs are checked only against their configured presets at the end of the sample period.

See page 36 for details. As the frequency of the incoming pulse train increases, the number of sampled pulses from the 4 MHz clock decreases. Because accuracy is related to the number of 4 MHz pulses received over the sample period, the accuracy will decrease with increasing input frequencies at the Z-input. The decrease in accuracy can be lessened by scaling the input frequency through the use of the Scaler tag.

By connecting over USB on newer cards, the user may skip the steps above and set an IP address directly. Once the connection is established, the user can go into the properties of the device or the other modules within the chassis and set the required parameters.

The most important step in getting started with PLC is communication with the device. Within the ControlLogix family, the most common means to connect at the ENxx modules. This can be accomplished through the use of the dip switches on the card. A rather simple alternative to the steps above would be to use a USB connection to the cards that support it.

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