SBC PCD2.M5 Series - Page 192

Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Analogue combined input/output modules
Input/output (I/O) modules
6-82
6
Function
Power supply
PCD2.W525s must have an external power supply. This power supply is electrically
isolated from both the PCD and the inputs/outputs of the W525. The design also
allows the use of the same power supply for the PCD and the W525 without losing
the galvanic separation. The diagram below shows the various areas of separation:
Timing
● Inputs
○ Internally, the W525 captures a new value for each input channel every
2 ms
○ This value can be read by the PCD at any time.
○ Depending on the speed of the PCD, the transmission time for each
  individualvaluescaledto16bit(forasingleinputchannel)isnormally
  100μs.
● Outputs
○ Internally, the W525 outputs the last output value received from the
PCD with a maximum delay of 2 ms.
○ Depending on the speed of the PCD, the transmission time for each
  individualoutputvaluescaledto16bitisnormally100μs.