Omron SMARTSLICE - 04-2008, Operation Manual

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18
Node Address Settings and I/O Allocation Section 2-2
Allocated Data Size
Note When allocating data, be sure that it does not exceed the maximum that can
be allocated (64 words).
Status Flags
The status flags can be allocated in the Master independently or together with
the I/O data. There are two kinds of status flags, the Communications Unit’s
status flags and I/O Units’ communications participating/withdrawn flags, and
these status flags must be allocated in separate areas.
Communications Unit’s
Status Flags These flags can be used to monitor the status of the connection with the Mas-
ter and the status of Slice I/O Units connected to the Communications Unit.
The status flags take up 2 words and the information is transferred to the Mas-
ter.
With the default data pattern (pattern 1), these status flags are allocated in the
Master together with the I/O data. The status flags can also be read with the
Configurator or an explicit message command.
Data type Data size
I/O data (input and output) When only the actual I/O data is allocated:
64 input words max. or 64 output words max.
The GRT1-ID4(-1) and GRT1-OD4(-1) use 4 bits
per Unit.
The GRT1-ROS2 uses 2 bits.
Communications Unit status flags 1 word
Slice I/O Unit communications
participating/withdrawn flags Participating flags: 4 words
Withdrawn flags: 4 words
Total: 8 words
I/O data (inputs) + Communica-
tions Unit status flags Amount of I/O data being used + 1 word
Bit Content Description
0 Slice I/O Bus Communications Error Flag Monitors the status of Slice I/O Terminal communications.
1 Reserved ---
2 Slice I/O Unit Warning Flag
0: Normal; 1: Error detected
Indicates a major Slice I/O Unit error. This flag goes ON when
there is an error in any one of the connected Slice I/O Units.
3 Reserved ---
4 Slice I/O Unit Alarm Flag
0: Normal; 1: Error detected
Indicates a minor Slice I/O Unit error. This flag goes ON when
there is an error in any one of the connected Slice I/O Units.
Status flags (16 bits)
Master CPU Unit
DeviceNet
Communications Unit
First word
I/O data (4 bits)
Status flags
Slice I/O Unit (4 inputs)
Input Area