User Manual

Logical I/O blo
cks
Addressing the I/O blocks
19
CM110664en_07 263 | 353
PX compact PXC12.D
PXC12-E.D
PXC22.D
PXC22-E.D
PXC36.D
PXC36-E.D
Module Channel Module
UIO
Universal
I/O
1 1..4
U5..U8
1 1..12
U5..U1
6
1 1..18
U7..U2
4
R1K, U10,
T1, N1K,
P1K, C,
D20,
D20S
UIO
Universal
I/O with
Q250
4 1..4
U1..U4
4 1..4
U1..U4
4 1..4
U1..U6
R1K, U10,
T1, N1K,
P1K, C,
D20,
D20S,
Q250
Layout of PXC36.D housing with address ranges
See
Automation stations, compact model PXC..D (CM1N9215).
Multiple use of sensors
Multiple use by addressing the physical I/Os in two or more logical I/O blocks
(as shown in the following figure) is not allowed.
If you wire it as in the figure above, Xworks Plus (XWP) determines multiple
use and generates an error message.
For the multiple use of output blocks, the plant will malfunction, because there
will then be two or more sources acting on one switching command. The
effective switching command (at the output) is the last one received
(determined by the rule "the last command takes precedence"). In other words,
the order of processing determines which source or origin will be linked to the
output.
In CFC the same address can be allocated to two or more input or output
blocks. This multiple address allocation goes undetected when the program is
compiled; the automation station also fails to recognize the error (a reliability
error is generated and an error message is transmitted only in the case of
multiple address allocation with two different signal types).
HMI / TOOL
DO1
U1 U2 U3 U4
U5 U6 U7 U8
U9 U10 U11 U12
U13 U14 U15 U16
U17
U18
U19
U20
U21
U22
U23
U24
T
AI
Island bus
R
I/O module
Program in XWP
Block
1
0
6
6
4
-
2
4
z
0
2
e
n
AI
Island bus
Multiple use of I/O
signals