ANALOG INPUT MODULE
Also available: V470 Analog Output Module
- 16 channels of fully isolated analog input acquisition, each independently programmable for mode and input range.
- Voltage mode: input ranges from ±25 mV to ±250 volts.
- Thermocouple mode: reports temperature for types
J K E T R S B N.
- Includes four non-isolated precision RTD signal conditioners, plus one on-board temperature sensor.
- Reports thermocouple loop resistance and detects open thermocouples without inducing offset errors.
- 24-bit basic ADC resolution.
- No realtime handshaking required—once channel parameters are set up, measurements appear in dual-port memory registers with VMEbus-speed access.
- Supports one or two optional 8-channel J470 isothermal junction boxes, each with integral RTD reference junction sensor, or one or two J475 field-wiring interface boards.
- Test connector supports in-crate calibration check.
- Optional built-in self test (BIST).
- Clearly labeled dipswitches set VME address; no jumpers, headers, or trimpots.
An internal microprocessor manages all data I/O and communicates with the VME bus via a transparent, VMEbus-speed dual-port memory.
Each channel may be user programmed to operate in voltage-input or thermocouple acquisition mode. In each mode, channel operating parameters, acquired measurements, and status flags are accessible in dedicated VME registers. Data rate/filtering options are provided. Data acquisition is managed autonomously by the processor, so VME masters may set channel parameters or read acquired measurements at any time at full VMEbus speed. Any channel can be associated with any of the reference junction sensors located in the external field-wiring termination panels, or can use the on-board sensor. Cold-junction compensation is via table lookup of thermocouple potential for the type currently selected. Reference junction temperatures are readable.