AMCI 7500 Series Manual de início rápido - Página 11
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Programming Example
The three rung ladder logic program below can be, but does not have to be, used to program a 7500
module. This example assumes the module is located in slot 1 of the SLC rack and uses the following
addresses.
N7:0/0
Manually set to initiate data transfer to the 7500 module.
N7:10 - N7:17 Holds data written to the 7500 module at output words O:1.0 - O:1:7.
I:1.0/15
7500 ACKnowledge bit.
O:1.0/15
7500 Transmit bit.
Manually set bit N7:0/0 to initiate the transfer of data to the 7500 module. Note that the data in
N7:10 does not have transmit bit O:1/15 set. This rung is performed until acknowledge bit I:1/15 is
set.
Set to write to
7500 module
N7:0
0
When bit N7:0/0 has been manually set, this rung sets transmit bit O:1/15, which tells the 7500
module to act on the data located in the output image table. This rung is true as long as bit N7:0/0 is
set, and the module has not responded by setting acknowledge bit I:1.0/15.
Set to write to
7500
7500 Module
ACK bit
N7:0
0
The following rung unlatches bit N7:0/0 when the 7500 module has set acknowledge bit I:1/15 in
response to the transmit bit being set in rung two. The Programming cycle is now complete.
Set to write to
7500
7500 module
ACK bit
N7:0
0
Document Number: 940-55010
7500
ACK bit
I:1
15
I:1
15
I:1
15
COP
COPY FILE
Source: #N7:10
Dest:
#O:1.0
Length: 8
7500 Transmit
Bit
O:1
(
)
15
Set to write to
7500 Module
N7:0
( U )
0