National Instruments NI 9144 - page 53

© National Instruments Corporation 53 NI 9144 User Guide and Specifications

Where:

6:2 Clock Divisor

1:0 Clock Source

IEPE Enable <3:0>

When set, the corresponding channel’s relays are switched to IEPE operation. IEPE operations

switches the AC/DC relay to AC mode and enables the IEPE relay to send the current to the IEPE

sensor.

AC/~DC <3:0 >

Controls the AC/DC relay when IEPE is not selected. If IEPE is enabled, then these bits have no

meaning as AC mode is always selected with an IEPE operation.

Clock Divisor

The NI 9234 divides the clock source (internal or external) by this value and uses it as the

converters’ oversample clock. The data rate is equal to 1/256 times this oversample clock frequency.

Valid values for Clock Divisor are from 1 to 31, and the final divided clock must be between

100 KHz and 12.8 MHz.

Clock Source

0b00 = 0 The OCLK pin is used as the oversample clock source.

0b01 = 1 The 12.8 MHz internal clock is used as the clock source and this 12.8 MHz

is driven onto the OCLK pin.

0b10 = 2 The internal clock is used but not driven onto OCLK pin. Currently, this is

the required clock setting.

0b11 = 3 Reserved.

Table 47. NI 9234 Scan List Format (Continued)

Bits Field

Contents

Main USER GUIDE AND SPECIFICATIONS NI 9144 Deterministic Ethernet Expansion Chassis for C Series Modules Contents Introduction Safety Guidelines Safety Guidelines for Hazardous Locations Special Conditions for Hazardous Locations Use in Europe Special Conditions for Marine Applications Mounting the NI 9144 Chassis Figure 2. NI 9144 Chassis, Bottom View with Dimensions Figure 3. NI 9144 Chassis, Front View with Dimensions Mounting the NI 9144 Chassis on a Panel National Instruments Corporation 7 NI 9144 User Guide and Specifications Figure 5. Installing the Panel Mount Accessory on the NI 9144 Chassis Figure 6. Dimensions of NI 9144 Chassis with Panel Mount Accessory Installed Caution Remove any C Series I/O modules from the chassis before removing it from the panel. Mounting the Chassis on a DIN Rail Connecting the NI 9144 Chassis to a Network Understanding LED Indications POWER LED FPGA LEDOpen FPGA Mode Only RUN and ERR LEDs INIT PRE-OP SAFE-OP Resetting the NI 9144 Network Configuration Safe-State Outputs Slave Timing Modes Updating your Firmware Using the NI 9144 with an EtherCAT Third-Party Master Using AoE/SDO Using CoE/SDO Specifications Network Power Requirements Physical Characteristics Safety Voltages Hazardous Locations Environmental Shock and Vibration Cabling Safety Standards Electromagnetic Compatibility CE Compliance Online Product Certification RoHS Appendix A Vendor Extensions to the Object Dictionary Supported C Series Modules C Series Modules with No Configurable Options NI 9201/9221 NI 9201/9221 Scan List NI 9201/9221 Calibration Data NI 9203 NI 9203 Scan List Page NI 9203 Calibration Data Page NI 9205/9206 NI 9205/9206 Scan List Page NI 9205/9206 Calibration Data NI 9211 NI 9211 Scan List NI 9211 Calibration Data NI 9213 NI 9213 Conversion Speed Control NI 9213 Common Mode Error/Status NI 9213 Scan List NI 9213 Calibration Data NI 9215 NI 9215 Calibration Data NI 9217 NI 9217 Conversion Speed Control NI 9217 Scan List NI 9217 Calibration Data NI 9219 NI 9219 ADC Format NI 9219 Error Status NI 9219 Calibration Data Page NI 9219 Configuration Commands Page Page Page Page Page Page NI 9233 NI 9233 Configure ADC Page NI 9233 Calibration Data NI 9234 NI 9234 Configure Module Page NI 9234 Example Data Rates NI 9234 Calibration Data NI 9237 NI 9237 Configure Module Page NI 9237 Example Data Rates NI 9237 Calibration Data NI 9229/9239 NI 9229/9239 Calibration Data NI 9263 NI 9263 Calibration Data NI 9264 NI 9264 Calibration Data NI 9265 NI 9265 Error Status NI 9265 Calibration Data NI 9401 NI 9401 Direction Control NI 9403 NI 9403 Direction Control NI 9476 NI 9476 Error Status Where to Go for Support