ANALOG SIGNAL PROCESSOR (ASP) CARDS FOR ANALOG OUTPUT

The Analog Signal Processor card or card set is the heart of every SPS6000 system. Every mainframe has standard slots for up to two ASP cards. The principal functions of an ASP card are

  • to perform real-time “mx + b” scaling and calibration of analog input signals received from system conditioner cards, based on transducer and output values entered by the user through the Configurator Software (following this initial “calculated” calibration, additional on-line “zero and span” calibration can be performed, if necessary, to improve measurement accuracy)
  • to apply specific processing functions to these signals on a real-time basis, if required, via user-specified FUNCTION MODULES installed on that ASP card
  • based on these scaling, calibrating, and processing functions, to generate high-level analog outputs for delivery to an external PC, PLC, or other data acquisition system supplying its own A/D conversion, and also to generate logic outputs for control and annunciation The Model SPS6208 Analog Signal Processor Card can produce up to 8 independent analog outputs; the Model SPS6216, up to 16.

ASP analog output specifications are as follows:

  • Accuracy: 0.02% of full scale, typical, following calibration by the user
  • Voltage: ±10 V-DC will drive 500  load*
  • Bandwidth: Up to 10 kHz, set by conditioner card

An SPS6000 system can have up to 32 analog outputs in all. When setting up each analog output channel via the Configurator Software, you must enter the tag name of the output’s “source” (input channel or function module). The output’s “terminal” number corresponds to one of the 16 screw-terminals on the ASP card’s output connector described below. In addition to 8 or 16 analog outputs, each ASP card has 8 logic input terminals and 8 logic output terminals. The specific function of each logic line will be determined by the user during system configuration.** In general, ASP logic inputs are accepted directly from external dry contacts (switches, relays, etc.) or an active CMOS-compatible logic system, and are used to control the activity of individual function modules. Logic outputs are used to report the status and results of function module activity to external control and annunciation devices. ASP logic I/O specifications are as follows:

  • General: +5-V Reference Supply provided; maximum current is 50 mA, total; external reference supply may be used; allowable VCC range is +5 to +24 V
  • Logic Inputs: High-impedance device with internal 10-k pull-up to VCC (“Logic 1”); may be driven by TTL, LSTTL, CMOS (+5 V), or through dry contacts to Common
  • Logic Outputs: Open-collector current sink with internal 10-k pull-up to VCC; maximum sink current is 50 mA per output

A special screw-terminal connector assembly attaches to the rear of each ASP card. Supplied with each ASP card, the “conventional” Model SPS6046 ASP Connector allows direct attachment of multiconductor cables for the delivery of analog outputs to the host device.* It is also used for connection of the ASP card’s logic input and output signals. If you want your SPS6000 to conform to CE STANDARDS, the CE-COMPLIANT Model SPS6056-CE Connector may be separately ordered.

 
 
 

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