Siemens Simatic S7-400 - Manual (Page 181)

Digital Modules
4-59
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
4.16 Digital Output Module SM 422;
DO 16 24 VDC/2 A; (6ES7422-1BH10-0AA0)
Characteristics
The digital output module SM 422; DO 16 24 VDC/2 A has the following
features.
• 16 outputs, isolated in two groups of 8
• 2 A output current
• 24 VDC rated load voltage
The status LEDs also indicate the system status even when the front connector is
not inserted.
!
Caution
To commission the module, the rated load voltage must be applied at least once to
each group of 8 outputs (e.g. connection of 1L and 3L). If voltage is not applied to
a group due, for example, to 1L and 2L failing, all the outputs switch off, even
those in the second group. The status LED continues to function in the same way.