Page 1: Table Of Contents
ControlLogix 7262 SSI Interface Manual Revision 1.3 Table of Contents Installing the 7262 Module Chapter 1 Hardware Overview Chapter 2 Module Specifications Front Panel & LED Function Connector Pinout Wiring Notes Latching Input Wiring SSI Protocol Programmable Parameters Chapter 3...
Page 2 Chapter 1: INSTALLING THE 7262 MODULE Configuring the ControlLogix System 1. Open RSLogix 5000 and the project in which you want to install the AMCI 7262 module. 2. Right click on I/O Configuration in the Project Tree. 3. Select New Module.
Page 3: Hardware Overview
Operating Temperature: 0 to 60° C Relative Humidity: 5 to 95% (non-condensing) Storage Temperature: -40 to 85° C EDS File An EDS file for the 7262 module can be downloaded from the Tech Library section of AMCI’s website, www.amci.com. FLASH Memory The 7262 module’s parameter values are stored in a non-volatile Flash memory.
Page 4: Front Panel & Led Function
ControlLogix 7262 SSI Interface Manual Revision 1.3 Front Panel: Status LED AMCI SSI Solid Red Data Flash Memory Fault Status Blinking Red/Green Module Hardware Comm. Failure Blinking Red Output Data Fault Solid Green No motion occurring Blinking Green Motion on at least one channel...
Page 5: Wiring Notes
Because the rack cabinet is typically better grounded than the machine, AMCI recommends that the cable shields be terminated at the 7262 module. However, if your cable shield is attached to the sensor’s housing, and the sensor is grounded through its mounting, you must not connect the cable shields to the 7262 module because this will create a ground loop.
Page 6: Latching Input Wiring
The following figure shows how a 7262 reads data from a SSI transducer. Note that the formal SSI definition allows for twenty-four bits of data and a twenty-fifth stop bit. However, AMCI is aware of some transducers that transmit more or less than twenty-five bits. To accommodate these transducers, the 7262 can be programmed to accept up to thirty-two bits in the SSI bit stream.
Page 7: Programmable Parameters
One, the Interpolated Data Value along with the time value can be sent to other ControlLogix modules, for example the AMCI 8213-VA, allowing them to schedule their responses with a high degree of precision. Two, the Interpolated Data Value allows the user to “Look Ahead” to what the Data Value will be at a defined time in the future.
Page 8: Limit Switch Position
ControlLogix 7262 SSI Interface Manual Revision 1.3 Limit Switch Position: This two word parameters defines ON and OFF setpoints. If the ON setpoint is less than the OFF setpoint, a bit in the Input Registers, which can be easily interrogated by a relay instruction, will be set when the Data Value is between these two setpoints.
Page 9: Data Setup Parameters
ControlLogix 7262 SSI Interface Manual Revision 1.3 Data Setup Parameters: Once the 7262 module has extracted the SSI data from the data stream, it uses the Data Setup Parameters to convert the raw SSI data into the Data Value it reports to the PLC.
Page 10: Preset Value
ControlLogix 7262 SSI Interface Manual Revision 1.3 Step 3: Determine the Scalar Multiplier and Divisor values. Desired Resolution (counts/inch) = 10000 counts/inch = 100 = 50 LDT Resolution (counts/inch) 25400 counts/inch Therefore, to use a sensor with 1µm resolution and get 0.0001 inches per count resolution, use a Scalar Multiplier of 50 and a Scalar Divisor of 127.
Page 11: Message Instructions
ControlLogix 7262 SSI Interface Manual Revision 1.3 Chapter 4: Message Instructions The programming of the 7262 module’s Setup data requires the use of Message Instructions. The format of this instruction is shown below. 1. A different message instruction is needed for each channel of the 7262 module.
Page 12: Writing Data Setup
ControlLogix 7262 SSI Interface Manual Revision 1.3 Source Length: If the Message Instruction is being used to send data to the 7262 module, then the Source Length parameter must be equal to 36 bytes. If the Message Instruction is being used to read data from the 7262 module, then the Source Length Parameter must be set to zero.
Page 13: Communication Tab
ControlLogix 7262 SSI Interface Manual Revision 1.3 Message Configuration – (Communication Tab) When the Configuration window shown above is completed, click on the Communication tab. The following window will open. Click on the Browse button and set the path parameter to the slot where the 7262 module is located. All of the remaining Communication parameters can remain at their default settings.
Page 14 ControlLogix 7262 SSI Interface Manual Revision 1.3 Chapter 5: Setup Data The message instructions described in chapter 3 above are used to send the setup data to the two channels of the 7262 module. This data consists of nine 32 bit words (36 bytes) shown in the following table. Each channel can be programmed with different setup data.
Page 15: Reading Status Data
ControlLogix 7262 SSI Interface Manual Revision 1.3 Chapter 6: Reading Status Data The message instructions described in chapter 4 above can be used to read the current setup data from each of channels of the 7262 module. This status data consists of ten 32 bit words, shown in the following table. The destination address must be made up of a tag array that is at least 10 DINT words long.
Page 16: Input Registers
ControlLogix 7262 SSI Interface Manual Revision 1.3 Chapter 7: Input & Output Data Input Registers: (Data sent from the 7262 module to the PLC) The input data consists of six (for 1 channel) or twelve (for 2 channels) 32-bit words, and is read by the PLC at the RPI (Requested Packet Interval) Time that is asynchronous to the Ladder Logic Program.
Page 17: Status Bits
That is, you will have to use message instructions to program your setup data at every power up. If you do not want to use the module in this way, it must be returned to AMCI for repair. Bits 16 to 31: Reserved for future use Input Register Description Data Value: This register contains the converted and scaled data from the sensor.
Page 18: Output Registers
ControlLogix 7262 SSI Interface Manual Revision 1.3 Output Registers: (Data sent from the PLC to the 7262 module) The output registers are used to execute commands that typically occur during machine operation, while module setup functions are accomplished with the use of Message Instructions. See chapter 3 and 4 for configuring the 7262 module.
Page 19: Interpolation Command Programming Cycle
ControlLogix 7262 SSI Interface Manual Revision 1.3 Interpolation Command Programming Cycle 1. The Interpolated function will only work if the RPI Time is less than or equal to 28ms. 2. The ladder logic program reads the desired Central System Time value from the PLC using a GSV instruction.
Page 20: Manual Revision History
ControlLogix 7262 SSI Interface Manual Revision 1.3 Chapter 8: Manual Revision History Revision 0.0 was created 05/23/08 and was the initial release of the specifications Revision 1.0 was created on 6/16/08. The I/O configuration size was corrected. It should have been 6 (for one channel) or 12 (for two channels).