SPS 6000 General Description & Features

The Daytronic SPS6000 Signal Processing System serves as a high-speed front end for PC-based data acquisition systems, distributed control systems, and industrial PLC’s. In addition to the highest-quality signal conditioning, it provides user-configured signal processing functions that operate independently of the host device at a true analog speed—as required by many test and manufacturing applications being developed today. Through continuous analog processing, the SPS6000 allows easy capture of actual—not approximated— details of even the most dynamic measurement signals, while analog limit decisions can be made to provide instantaneous outputs on critical violations. By assuming full responsibility for “real-time” signal conditioning and monitoring, a front-end SPS6000 optimizes the performance of the user’s A/D system, allowing that system to make the best use of the high-quality analog signals that result. The SPS6000 system continues to build on Daytronic’s long-standing reputation for rock-solid signal conditioning. Each SPS6000 mainframe can accept a wide variety of real-world measurement signals that are traditionally difficult to get into a digital device, including AC/DC strain and LVDT inputs. It yields ±10 V-DC true analog outputs accurate to 0.02% of full scale, following calibration by the user.

SPS6000’s flexible modular design allows for the use of Daytronic’s proven “A Card” Signal Conditioners in a low-noise front-end environment that ensures drift-free measurement and dependable control action. These conditioner cards provide powerful low-pass active filtering for quieting noisy signals and eliminating aliasing problems in the user’s A/D converter, which can otherwise introduce significant errors. An enhanced series of “AA” cards offers programmable analog filtering (among other important new features). See the latest Daytronic Conditioner Cards Catalog for complete descriptions and specifications of all current SPS6000-compatible “10A” and “AA” conditioner cards. Every SPS6000 chassis has slots for up to 8 signal conditioning cards (up to 32 analog input channels*), and for one or two Analog Signal Processor (ASP) cards. Each ASP card provides real-time scaling and calibration of analog input channels, and can issue either 8 or 16 finished analog outputs to the host device. Standard SPS6000 systems thus allow up to 8, 16, or 32 analog outputs in all. Each output derives from an installed signal conditioner card or from the output of an internal system function module.

Simple cabling connects each ASP card’s analog outputs to one or two Industry Standard PC-based Data Acquisition Cards or to appropriate PLC input terminals. Cables can be up to 50 feet long without loss of accuracy. Regardless of its channel capacity, every ASP card contains socket locations for up to 8 user-selected function modules. Described in detail in Section 2.d, these modules handle the high-speed front-end analog signal operations that set SPS6000 apart from other signal conditioning systems. An ASP card can receive up to 8 logic inputs for the direct control of its assigned processing functions, and can generate up to 8 logic outputs for external annunciation of the status of these functions.

It is helpful to look at SPS6000 as an extremely versatile analog pathing system. Fig. 2 shows how the “raw” analog measurement signal received from a conventional electromechanical transducer is conditioned and filtered by an appropriate Signal Conditioner Card before being presented as input to an Analog Signal Processor Card. One or more function modules on the ASP card can receive the input signal, operate upon it as specified by the user via the Configuration Software, and present their respective analog outputs either to the ASP card’s output pins or to other function modules. By virtue of the logic control functions by which individual function modules can be interconnected, any number of real-time processing routines are possible. 

The system’s integral front-panel display with operator keypad permits any active SPS6000 analog output to be viewed either as a finished engineering unit answer or as a pure voltage. You can also display any active SPS6000 input channel or function module output as an engineering-unit value. Via the front-panel buttons and display, the operator can perform “on-line” calibration functions on a temporary “run-time” basis—provided that the level of security presently set for the system allows such operations.*

An easy-to-use Windows-based software package is furnished with each SPS6000 that lets the user configure the system in a short time. In addition to “locating” and calibrating all input measurement signals, the configuration procedure includes the assignment of unique “tag names” to create the specific analog pathing required by a particular application. The setup computer connects to the SPS6000 through a separate serial link. Any application can be set up entirely by means of the Configuration Software. A standard configuration worksheet is also available, however, to simplify the setup procedure for applications that call for relatively complex function module interconnections. The worksheet helps the user lay out a functional “block diagram” for the complete SPS6000 system 


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