Mitsubishi QD51 User Manual

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MELSEC-Q
3 SPECIFICATIONS
3.5.7 Special relay (EM9000 to EM9127)
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.
Buffer Memory
Address as
viewed from
the CPU
Special
Relay No.
Name Content Detailed Contents
Related
Special
Registers
&H2500, bit 0 EM9000
Error
Registration
Flag
ON : An error is registered.
OFF: No error is registered.
Goes ON when one of the following occurs.
• Warning Error
• Error Message
• System Down Error Message
ED9000 to
ED9016
&H2501, bit 4 EM9020
Operation
Flag
ON: Multitask execution in
progress
OFF: Task other than multitask
• Goes ON when the QD51 (-R24) is
executing multitasks.
• Goes OFF when the QD51 (-R24) is
executing a task other than multitasks.
(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.

Mitsubishi QD51 Specifications

General

Brand	Mitsubishi
Model	QD51
Category	Controller
Language	English