Output From Controller To Module - Siemens SIMATIC 505 PPX:505–6108A User Manual

NOTE: Bit 1 (the sign bit) is used to check for a negative number sent to the
output module. If this bit is set to 1, the output for the point is not updated,
and the last positive output is repeated.
The resolution of the module is 8 counts out of 32000, regardless of whether
the signal is used as voltage or current. Therefore, the smallest step unit for
voltage is 2.5 mV and for current is 5 µA. To calculate the digital word
necessary to achieve a certain output voltage or current, use the following
equations.
Series 505 Analog I/O Modules User Manual
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MSB
1 2 3 4
Digital word to be converted
Sign bit
1 = negative
0 = positive
Figure 1-6 Output from Controller to Module
Desired output voltage
Digital word (WY) +
Desired output current (mA)
Digital word (WY) +
5 6 7 8 9 10 11 12 13 14 15 16
32000
10 V
20 mA
LSB
Not used. Set to 0.
32000
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