SIEMENS 6ES7235-0KD22-0XA0 EM 235 Analog I/O Module

Technical Specifications for 6ES7235-0KD22-0XA0

Full Description:

The EM235 combination inputoutput module is a low-cost, high-speed 12 bit analog input module. The module is capable of converting an analog input to its corresponding digital value in 171 μsec for the CPU 212, and 139 usec for all other S7-200 CPUs. Conversion of the analog signal input is performed each time the analog point is accessed by the user program. These times must be added to the basic execution time of the instruction used to access the analog input.

The EM235 provides an unprocessed digital value (no linearization or filtering) that corresponds to the analog voltage or current presented at the modules input terminals. Since the module is a high-speed module, it can fllow rapid changes in the analog input signal (including internal and external noise). Reading-to-reading variations caused by noise for a constant or slowly changing analog input signal can be minimized by averaging a number of readings. As the number of readings used in computing the average value increases, a correspondingly slower response time to changes in the input signal will be observed. You may use the STEP 7-Micro/WIN Analog Input Filtering wizard to add an averaging routine to your program. Remember that an average value computed from a large number of samples will stabilize the reading while slowing down its response to changes in the input signal. For slowly changing analog input signals, a sample size of 64 or greater is recommended for the averaging routine.

The specifications for repeatability describe the reading-to-reading variations of the module for an input signal that is not changing. The repeatability specification defines the limits within which 99% of the readings will fal. The mean accuracy specification describes the average value of the error (the difference between the average value of individual readings and the exact value of the actual analog input signal). The repeatability is described in Figure A-47 by the bell curve. This figure shows the 99% repeatability limits, the mean or average value of the individual readings and the mean accuracy in a graphical form. Table A-5 gives the repeatability specifications and the mean accuracy as they relate to each of the configurable ranges.

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