VMIVME-3215 Intelligent 8-Channel Thermocouple Board

Description

VMIVME-3215 Intelligent 8-Channel Thermocouple Board

• Eight isolated, differential input channels
• On-board 16-bit microcomputer
• Linearization and cold junction compensation for thermocouple types J, K, T, E, R, S, B, N, W-Re
• Accepts multiple thermocouple types simultaneously
• High CMV isolation: 1,000 V
• Dual port registers for minimum host overhead
• High common-mode rejection: 120 dB at 60 Hz
• Local or remote cold junction compensation
• Program-selected measurement units, resolution, and data format
• Nonvolatile storage of calibration parameters, eliminates channel adjustment potentiometers
• A/D converter, 12 bits plus sign
• Inputs filtered and normal mode protected to 130 VRMS
• Optional high-level inputs available with provision for current loop termination
• Built-in-Test (BIT)
• GE Fanuc 90-70 series approval

INTRODUCTION —

The VMIVME-3230 is an 8-channel low-level input board, specifically designed for
use with thermocouple inputs. The board performs reference (cold) junction temperature compensation and
provides linearization for a variety of thermocouple types. All inputs are filtered and isolated, and are protected
against normal-mode overvoltage. An optional configuration offers high-level inputs. The major
VMIVME-3230 functional blocks are illustrated in Figure 1.
Thermocouple connections are made at a screw terminal block which connects directly to the front panel
P3 connector. Provisions are also included for remotely locating the thermocouple connections and cold junction sensor.
FUNCTIONAL CHARACTERISTICS
Compliance: This product complies with the VMEbus specification Rev. C. 1 with the following
mnemonics:
A16: D16: D08 (EO) Slave: 29, 2D Form Factor: 6U
Board Address Selection: The base address of the board is selected by 11 on-board jumpers. This board may be operated in any slot except slot one.

Addressing Scheme: This board is addressed as 16 contiguous, 16-bit registers, located on any
16-word boundary within the short supervisory or short nonprivileged I/O space.
VMEbus Address Modifier: Address modifier
lines are decoded to support either I/O access stated above. A single jumper is provided to support this
feature. It is factory configured for short supervisory access.

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