Omron CRT1 - 10-2008, Operation Manual

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107
Allocating I/O Data Section 5-2
Alarm Status Area
The Digital I/O Slave Unit's Alarm Status Area contains the following 16 bits.
These bits indicate serious errors in the Unit.
5-2 Allocating I/O Data
Input and output areas in I/O memory in the Master Unit are allocated to the
I/O data of Word Slave Units in a CompoNet Network. Node address areas
are allocated in order of node addresses for Slave Units of the same type. In a
CompoNet Network, Units are allocated node address areas of the size
required for each Unit, based on the node address set for the Unit.
5-2-1 Data Allocation for Word Slave Units
Word Slave Units are allocated node address areas in units of 16 points (one
word).
• Units with 8 inputs or outputs are allocated one word (the node address
set for the Unit).
• Units with 16 inputs or outputs are allocated one word (the node address
set for the Unit).
• Units with 16 I/O points (8 inputs and 8 outputs) are allocated two words
(the node address set for the Unit). The data is allocated to the lower
bytes of the words, and the upper bytes remain unused.
14 Reserved ---
15 Reserved ---
Bit Content Description
Bit Content Description
0 Reserved ---
1 EEPROM Data Error Flag
OFF: Normal
ON: Error occurred
Turns ON when there is an error in
the EEPROM data.
2 Reserved ---
3 Reserved ---
4 Reserved ---
5 Reserved ---
6 Reserved ---
7 Reserved ---
8 I/O Power Supply Status Flag 1
OFF: I/O power is ON
ON: I/O power is not ON.
Turns ON when I/O power is not
being supplied.
9 I/O Power Supply Status Flag 2
OFF: I/O power is ON
ON: I/O power is not ON.
Turns ON when I/O power is not
being supplied to the Expansion Unit.
10 Reserved ---
11 Reserved ---
12 Operation Time Configuration Flag
OFF: Normal
ON: Error
Turns ON when a threshold value is
set for the operation time monitor
function between a Digital I/O Slave
Unit and Expansion Unit if an Expan-
sion Unit is not connected.
13 Reserved ---
14 Reserved ---
15 Reserved ---