6ES7 235 0KD22 0XA0 EM 235 Siemens Analog I/O Module
6ES7 235 0KD22 0XA0 EM 235 Specifications:
0 to 10 V, 0 to 5 V, 0 to 1 V, 0 to 500 mV, 0 to 100 mV, 0 to 50 mV ± 10 V, ± 5 V, ± 2.5 V, ± 1 V, ± 500 mV, ± 250 mV, ± 100 mV, ± 50 mV, ± 25 mV 0 to 20 mA |
Configuration for EM235
Table 2 shows how to configure the EM235 module using the configuration DIP
switches. Switches 1 through 6 select the analog input range and resolution. All inputs
are set to the same analog input range and format. Table 3 shows how to select for
unipolar/bipolar (switch 6), gain (switches 4 and 5), and attenuation (switches 1, 2, and
3). In these tables, ON is closed, and OFF is open.
Table 2 EM235 Configuration Switch Table to Select Analog Input Range and Resolution
Unipolar | Full-Scale Input | Resolution | |||||
SW1 | SW2 | SW3 | SW4 | SW5 | SW6 | ||
ON | OFF | OFF | ON | OFF | ON | 0 to 50 mV | 12.5 V |
OFF | ON | OFF | ON | OFF | ON | 0 to 100 mV | 25 V |
ON | OFF | OFF | OFF | ON | ON | 0 to 500mV | 125 V |
OFF | ON | OFF | OFF | ON | ON | 0 to 1 V | 250 V |
ON | OFF | OFF | OFF | OFF | ON | 0 to 5 V | 1.25 mV |
ON | OFF | OFF | OFF | OFF | ON | 0to 20 mA | 5 A |
OFF | ON | OFF | OFF | OFF | ON | 0 to 10 V | 2.5 mV |
Bipolar | Full-Scale Input | Resolution | |||||
SW1 | SW2 | SW3 | SW4 | SW5 | SW6 | ||
ON | OFF | OFF | ON | OFF | OFF | +25 mV | 12.5 V |
OFF | ON | OFF | ON | OFF | OFF | +50 mV | 25 V |
OFF | OFF | ON | ON | OFF | OFF | +100 mV | 50 V |
ON | OFF | OFF | OFF | ON | OFF | +250 mV | 125 V |
OFF | ON | OFF | OFF | ON | OFF | +500 mV | 250 V |
OFF | OFF | ON | OFF | ON | OFF | +1 V | 500 V |
ON | OFF | OFF | OFF | OFF | OFF | +2.5 V | 1.25 mV |
OFF | ON | OFF | OFF | OFF | OFF | +5 V | 2.5 mV |
OFF | OFF | ON | OFF | OFF | OFF | +10 V | 5 mV |
Table 3 EM235 Configuration Switch Table to Select Unipolar/Bipolar, Gain, and
Attenuation
EM235 Configuration Switches | Unipolar/Bipolar Select |
Attenuation Select |
Gain Select | ||
SW1 | SW2 | SW3 | SW4 | SW5 | SW6 |
ON | Unipolar | ||||
OFF | Bipolar | ||||
OFF | OFF | x1 | |||
OFF | ON | x10 | |||
ON | OFF | x100 | |||
ON | ON | invalid | |||
ON | OFF | OFF | 0.8 | ||
OFF | ON | OFF | 0.4 | ||
OFF | OFF | ON | 0.2 |
Understanding and Using the Analog Input Module: Accuracy and Repeatability The EM231 and EM235 analog input modules are low-cost, high-speed 12 bit analog input modules. The modules are capable of converting an analog input to its corresponding digital value in 149 µsec. Conversion of the analog signal input is performed each time the analog point is accessed by your program. These times must be added to the basic execution time of the instruction used to access the analog input. The EM231 and EM235 provide an unprocessed digital value (no linearization or filtering) that corresponds to the analog voltage or current presented at the module’s input terminals. Since the modules are high-speed modules, they can follow 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 can be observed. 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 fall. 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 7 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 4 gives the repeatability specifications and the mean accuracy as they relate to each of the configurable ranges.
6ES7 235 0KD22 0XA0 Manual
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