Note
NE 21 and IEC 61131-2
For compliance with NAMUR Recommendation NE 21 and IEC 61131-2, use only power
supplies (230 V AC --> 24 V DC) with bridging of supply failures of at least 20 ms. You can find
up-to-date information on PS components on the Internet (http://
mall.automation.siemens.com).
Connecting power supply (X80 and X81)
Table 7-1
Connection of supply voltage (plug with screw-type terminals / connection scheme / plug
with push-in terminals)
Plug with screw-type terminals
Connection scheme (CFU PA ex‐
ample)
Plug with push-in terminals
; ;
/
/
0
0
/
/
0
0
0
/
[
;
;
/
/
0
0
[
1L+: Supply voltage: 24 VDC
1M: Supply voltage: Ground
2L+: Supply voltage: 24 VDC
2M: Supply voltage: Ground
x: Spring opener
Connect the M and L+ wires of a power supply to the connectors X80/X81.
● The power supply is connected using two 2-pin plugs (plug-in terminal blocks).
● A redundant power supply can be connected (plug connectors X80 and X81).
– Both inputs are decoupled.
– The ground connections of the plugs (1M and 2M) are connected to each other in the
CFU.
– There is no load distribution.
– With redundant infeed, the power supply unit with the higher output voltage supplies the
device exclusively.
● Two contacts each are located over each other for each potential (L+ and M). This ensures
that the power supply can be looped through (current: maximum 10 A).
● The power supply has a high-impedance connection with the housing to enable an
ungrounded installation.
Connecting
7.3 Connecting the power supply to the CFU
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD
57
Содержание Simatic CFU
Страница 8: ...Table of contents SIMATIC CFU 8 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 10: ...Security information SIMATIC CFU 10 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 16: ...What is a Compact Field Unit SIMATIC CFU 16 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 34: ...Operation planning 4 9 Use in hazardous areas SIMATIC CFU 34 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 46: ...Operating modes and functions 5 4 Measure frequency SIMATIC CFU 46 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 54: ...Installation 6 4 Removing the CFU SIMATIC CFU 54 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 202: ...Appendix A 10 Contact SIMATIC CFU 202 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 216: ...Glossary SIMATIC CFU 216 Commissioning Manual 08 2019 A5E39252870 AD ...
Страница 220: ...Index SIMATIC CFU 220 Commissioning Manual 08 2019 A5E39252870 AD ...