Omron EJ1 - 07-2008, Operation Manual

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Expansion Remote I/O Section 4-4
lating more than 100 parameters. Even if the number of parameters to be read
and written increases, modifications can be handled simply by changing oper-
ations in the memory of the master.
Note a) The parameters that can be specified are the ones that can be
changed during operation.
b) Expansion remote I/O cannot be used with simple I/O allocations.
4-4-2 Procedure for Reading Parameters
This section describes how to read parameters using expansion remote I/O.
Allocating Expansion
Remote I/O
Parameters
Allocate the following parameters in I/O memory by using the Configurator.
For information on allocation methods, refer to
4-3-2 Creating Allocation Data .
Note There are no restrictions on the locations for allocations.
Reading Parameters
by Using Memory
Operations
Use the following procedure to read parameters by using ladder program-
ming.
1,2,3... 1. Set the Read Parameter to the allocation number of the parameter to be
read. For the allocation numbers, refer to the
Allocation number for expan-
sion remote I/O column in the table in 4-3-3 Parameters for Which Alloca-
tion Is Possible .
Example: Allocation number for the set point = 18 (0012 hex)
2. Check that the allocation number specified in step 1 is set in the Read Pa-
rameter Monitor. If the same allocation number is set as in step 1, then the
specified parameter has been read normally. FFFF hex will be set in the
following cases.
• The Read Parameter is 0 at startup.
• There is no parameter that corresponds to the allocation number.
n+0
n+1
n+2
n+3
n+4
n+5
n+6
Address
m+0
m+1
m+2
m+3
m+4
m+5
m+6
Output Completed Flags
Read Parameter Monitor
---
Unit 0, ch1 parameter
Unit 0, ch2 parameter
Unit 1, ch1 parameter
Unit 1, ch2 parameter
: OUT Enable Bit
Read Parameter
Write Parameter
Unit 0, ch1 parameter
Unit 0, ch2 parameter
Unit 1, ch1 parameter
Unit 1, ch2 parameter
:
The parameter set in the Write
Parameter can be written.
Address
PLC Memory OUT Area
PLC Memory IN Area
The parameter set in the
Read Parameter can be read.
Area Parameter Description
OUT Area Read Parameter Used to the allocation number of the parame-
ter to be read. Always allocate memory to
this parameter.
IN Area Read Parameter Monitor Used to confirm that reading has been com-
pleted. Always allocate memory to this
parameter.
Parameters for specified
unit numbers and chan-
nels The values of the parameters corresponding
to the specified allocation number will be set.
Allocate memory for the required unit num-
bers and channels.