Omron GRT1 - 27-11-2006, Operation Manual

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33
Station Address Settings and I/O Allocation
Section 3-1
1. The presence of Turnback units and cables does not influence the auto-
matic allocation of Unit numbers.
2. The unit numbers allocated automatically to the SmartSlice I/O Units are
unrelated to the PROFIBUS station address set with the rotary switches.
3-1-3 SmartSlice I/O Allocation to the GRT1-PRT Unit
The SmartSlice I/O Units’ I/O data is mapped in the I/O memory of the GRT1-
PRT, from which it is transferred to the PROFIBUS Master unit. This allocation
is done automatically and determined by the SmartSlice I/O Unit’s type. The
figure below shows this mapping.
Note 1. I/O data is mapped in the order of SmartSlice I/O Unit connection to the
PROFIBUS Communication Unit, regardless of the I/O Units’ models.
PROFIBUS
Communication Unit
The SmartSlice I/O unit numbers are assigned
automatically in order, from left to right.
I/O
#1 I/O
#2 I/O
#3 I/O
#4 I/O
#64
: :
E
Connected order
I/O memory
A B
C D
E
PROFIBUS
Communication
Unit
A
B C D
SmartSlice I/O Units
I/O Data is mapped in the order in which
the Units are connected, from low to high.
I/O Units with bit allocation are mapped from
the rightmost to leftmost bit, in 2-bit units.
I/O Units with word allocations are mapped
from the low to high word address
0
8
16
Order of allocation
(1) Communication Unit
(2) Each SmartSlice I/O Unit's I/O
data.
(3) SmartSlice I/O Unit
network participation
status.