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3 SPECIFICATIONS
3.5.7 Special relay (EM9000 to EM9127)
Buffer Memory
Address as
Special
viewed from
Relay No.
the CPU
&H2500, bit 0
EM9000
&H2501, bit 4
EM9020
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The special relays are relays whose use is determined internally in the QD51 (-R24).
ON/OFF control is performed by the QD51 (-R24) OS, so in each BASIC program,
read the ON/OFF status using the special variable B@ to use these relays.
Name
Content
Error
ON : An error is registered.
Registration
OFF: No error is registered.
Flag
ON: Multitask execution in
Operation
progress
Flag
OFF: Task other than multitask
(1) Reading of Special Relay ON/OFF Data
ON/OFF data are read from the special relay by the following methods.
• Using the special variable B@ of the BASIC program
• Using the FROM command in the sequence program
The special relays designation method differs as shown below for the special
variable B@ and the FROM command.
Detailed Contents
Goes ON when one of the following occurs.
• Warning Error
• Error Message
• System Down Error Message
• Goes ON when the QD51 (-R24) is
executing multitasks.
• Goes OFF when the QD51 (-R24) is
executing a task other than multitasks.
MELSEC-Q
Related
Special
Registers
ED9000 to
ED9016
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