Siemens SIMATIC S7-400 Hardware And Installation Manual page 188

Assembling the M7-400
With the details from the individual data sheets, you can calculate Current
Consumption I in this rack as follows:
Table 8-4
Module
CPU 488-3
IF 962-VGA
IF 962-COM
EXM 478
IF 961-DIO
IF 961-AIO
MSM 478
ATM 478
Short AT Module (LAN)
SM 431; AI 16 x 16 bits
SM 421; DI 32 x 34 VDC
SM 422; DO 32 x 34 VDC
IM 460-0
Total
From the data in Table 8-4, you see that to cover the current consumption
calculated here, you must install a power supply module PS 407 20A (for a
120/230 VAC supply) or PS 405 20A (for a 24 VDC supply) in the rack.
Note
If you wish to connect an expansion rack to the central rack via a send IM with
current transfer, you must take into account the current consumption of this
expansion rack when choosing the power supply module.
8-6
www.gkbpx.com
Calculation Example for Power Supply Module
Slots
Occupied
2
1
1
1
3
3
3
1
15
S7-400 and M7-400 Programmable Controllers, Installation Manual
+5 VDC
(Max. Current Consumption Values)
I / Module I Total
4500 mA 4500 mA
600 mA 600 mA
100 mA 100 mA
200 mA 200 mA
85 mA 170 mA
85 mA 85 mA
1000 mA 1000 mA
120 mA 120 mA
1400 mA 1400 mA
700 mA 2.100 mA
30 mA 90 mA
200 mA 600 mA
110 mA 110 mA
10075 mA
C79000-G7076-C424-01