Power Supply Concept
Product-specific requirements for an F I/O module are Product Manual described in the respective &. Otherwise, the following general requirements apply.
F I/O modules monitor and analyze the supplied SELV/PELV field supply voltage. If the field supply voltage is outside the permissible range, the F I/O module is passivated.
F I/O modules may only be supplied with power that does not have any surge voltages (burst and surge per IEC 61326‑3‑1 or IEC 61000‑7). To filter surge voltages, install filter modules or an external filter. When using external filters, make sure that the cable length from the filter to the fieldbus node is as short as possible.
The following filter modules can be used for each supply point for system and field supply with a nominal voltage of 24 VDC.
- Use a supply filter (750-626/xxx-xxx) for the system supply.
- Use a filter module for field-side power supply (750-624/xxx-xxx) or a supply filter (750-626/xxx-xxx) for the field supply.
1 | Filter module, 24 VDC, (750-626/xxx-xxx) |
2 | F I/O modules |
3 | Filter module, 24 VDC, (750-624/000-001) |
4 | F I/O modules |
US | System supply (24 VDC) |
UF1 | Field supply 1 (24 VDC) |
UF2 | Field supply 2 (24 VDC) |