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Master Remote I/O Communications Section 4-1
4-1-4 Procedure for Using Remote I/O Master
Fixed Allocations for Remote I/O
1,2,3... 1. Turn ON the communications, slave, and PC power supplies.
Note Turn ON the communications power supply prior to turning ON the
slave power supply or the slaves may not go online.
2. Switch the CPU Unit to PROGRAM mode.
3. Turn ON the Master Enable Switch (word n, bit 06). (The master will remain
enabled even if the power is turned OFF and back ON again.)
Note Execute this only when master communications are turned OFF. (If
the Master Enable Switch is turned ON when master communica-
tions are enabled, a Unit error will occur and a C2 error will be dis-
played on the 7-segment display on the front panel.)
4. Perform the following steps to start with the scan list disabled.
Skip to step 5. to re-register and enable the scan list.
Skip to step 6. to start with the scan list enabled without any changes to
the fixed allocations or scan list.
Note The mode can be confirmed from the dots on the 7-segment display
on the Master Unit.
Left dot not lit: Scan list enabled
Left dot flashing: Scan list disabled
a) Turn ON a Master Fixed Allocation Setting Switch (word n, bits 08 to
10).
b) Monitor and check the registered slave data area to see if communica-
tions are possible with registered slaves.
c) Turn ON the Scan List Enable Switch (word n bit 00) from a Program-
ming Device.
d) Go to step 6.
5. Perform the following steps to re-register the scan list when starting with
the scan list enabled.
a) Turn ON the Scan List Clear Switch (word n, bit 01) from a Program-
ming Device.
b) Turn ON a Master Fixed Allocation Setting Switch (word n, bits 08 to
10).
c) Monitor and check the registered slave data area to see if communica-
tions are possible with registered slaves.
d) Turn ON the Scan List Enable Switch (word n, bit 00) from a Program-
ming Device.
6. Start master remote I/O communications with the scan list enabled. Use
the software switches to start or stop communications.
7. Check to see if both the MS and NS indicators are lit green on the master
and all slaves.
8. Switch the CPU Unit to RUN mode.
User-set Remote I/O Allocations Using DM Area Settings
1,2,3... 1. Turn ON the communications, slave, and PC power supplies.
Note Turn ON the communications power supply prior to turning ON the
slave power supply or the slaves may not go online.
2. Switch the CPU Unit to PROGRAM mode.