A: SNAP MOUNTING RACKS AND POWER SUPPLIES
SNAP PAC R-Series Controller User’s Guide
67
Determining Power Requirements
Both the SNAP-PS5 and the SNAP-PS5-24DC power supplies provide 5 VDC power for loads up to 4 amps. The
SNAP-PS5U provides 5 VDC for loads up to 5 amps. In most cases this power is sufficient for a SNAP processor,
a rack, and the associated I/O modules. However, some combinations of modules, especially special-purpose
modules, may require additional power. You can use the following table to help determine power needs for
your I/O units.
IMPORTANT:
For a SNAP-PS5 or a SNAP-PS5-24DC power supply, the total power required must not exceed 4
amps. For a SNAP-PS5U, the total power required must not exceed 5 amps.
Item
Quantity
X Power
Req. (Amps)
Total Power
Required (Amps)
1
SNAP PAC R-series controller (except wired+wireless)
Wired+Wireless SNAP PAC R-series
1
1
1.200
1.500
1.200 or
1.500
SNAP-IDC5-SW digital input module
SNAP-IDC5-SW-NC digital input module
SNAP-AITM-8 analog input module
Isolated analog input and output modules (part numbers ending
in -i or iSRC) except SNAP-AITM-4i
0.200
All other 4-channel digital input and output modules except
mechanical relay outputs (
not
high-density digital modules)
0.050
SNAP mechanical power relay output modules
0.160
SNAP-AICTD, AICTD-4 analog input modules
High-density digital input and output modules
SNAP-AIMA-32, SNAP-AIMA-iH, SNAP-AIV-32, and
SNAP-AITM-4i analog input modules
All analog output modules except SNAP-AOA-iSRC and
SNAP-AOD-29-HFi
0.150
SNAP-AOD-29-HFi
0.300
SNAP-AIPM power monitoring module
SNAP-AIPM-3, SNAP-AIPM-3V power monitoring modules
0.100
SNAP-AILC and AILC-2 load cell modules
0.120
SNAP-AIRTD-8U analog input module
0.135
SNAP-AIARMS analog input module
SNAP-AIVRMS analog input module
SNAP-AICTD-8 analog input module
SNAP-AIMA, AIMA-4, and AIMA-8 analog input modules
SNAP-AITM and AITM-2 analog input modules
SNAP-AIMV-4 and AIMV2-4 analog input modules
SNAP-AIV, AIV-4, and AIV-8 analog input modules
0.170
SNAP-AIRTD analog input module
SNAP-AIR40K-4 analog input module
SNAP-AIR400K-8 analog input module
SNAP-AIRATE analog input module
0.190
SNAP-AIRATE-HFi analog input module
0.210
SNAP-SCM-ST2 and SNAP-SCM-SSI serial modules
0.200
SNAP-SCM-232, SNAP-SCM-485-422, SNAP-SCM-PROFI
SNAP-SCM-MCH16
not
powering a breakout board
0.250
SNAP-SCM-MCH16 powering a breakout board
0.700
Total
1
Current from 5-volt supply
