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Receiving Explicit Messages Section 9-2
9-2-1 List of PLC Object Services
PLC Objects provide the following services.
Status Read/Write for CPU Units
Services Service
code
Class ID Instance ID Request
service data
Contents
CPU Unit Informa-
tion Read
0E Hex C4 Hex
(2F Hex)
(See note.)
00 Hex Attribute ID =
64 Hex
Reads the operating mode of the
CPU Unit.
Attribute ID =
65 Hex
Reads if there is a fatal or non-fatal
error in the CPU Unit.
Attribute ID =
66 Hex
Reads CPU Unit model.
CPU Unit Write 10 Hex Attribute ID =
64 Hex,
Attribute Value
Changes the operating mode of the
CPU Unit.
Attribute ID =
65 Hex
Attribute Value
Clears errors.
CPU Unit Status
Read
40 Hex None Reads the detailed status of the CPU
Unit.
Operation status: Stop, run, CPU
standby
Operating modes: PROGRAM, MON-
ITOR, RUN
Fatal error information: Error flags,
including memory errors, I/O bus
errors, system errors
Messages: Message No. when MSB
instruction executed by CPU Unit
Error codes: Error code for the most
serious errors
Error messages: Messages stored in
CPU Unit when FAL/FALS instruction
executed