Special Function, Measured Value Acquisition At Channels 13 And; Selecting The Special Function; Stipulating The Adc Conversion Time; Processing Sequence Of The Analog Inputs - Siemens SIMATIC S5 Manual

3.4 Special Function, Measured Value Acquisition
at Channels 13 and 14

3.4.1 Selecting the Special Function

You select the special function by setting the main control byte 1 bit 3. With this bit set, there are
several changes compared with operation without the special function.

3.4.2 Stipulating the ADC Conversion Time

The conversion time of the ADC is fixed at 55 ms (jumper "D" on jumper base X6/X7 is not
evaluated).
The following limit values apply:

3.4.3 Processing Sequence of the Analog Inputs

The order in which the individual channels are processed changes so that a voltage channel always
follows a controller channel.
Channel 13 is normally used. If, however, "read channel 14 once" is requested (main control
byte 4, bit 3), channel 14 is read once instead of channel 13.
Fig. 3.4.3/1 Processing sequence of the analog inputs
IP244
C79000–B8576–C860–02
Special Functions for Plastic Machines
Thermocouples (channels 0 ... 13)
Fe-Constantan (L and J)
NiCr-Ni (K)
Pt 10%Rh-Pt (S)
Pt 13%Rh-Pt (R)
Voltage channels 13/14
max. 15 V
675 C
900 C
1600 C
1740 C
4–103