A decoupling module must be used:
If a mixed configuration is planned with temperature module, digital module and current measuring module or current/voltage measuring module, it must be checked first whether a decoupling module is required.
If
(Number (temperature module) * 2 + Number (digital module) * 1 + Number (current measuring module or current/voltage measuring module) * 4) > 14,
a decoupling module is then required.
For a calculation example, see the "SIPLUS HCS300I Heater Controller" System Manual, http://support.automation.siemens.com/WW/view/en/54439691.
Note:
For this equation, each module type is weighted with a specific current factor, see Table.
Module | Current factor |
Temperature module | 2 |
Digital module | 1 |
Current measuring module, | 4 |