Omron SYSMAC CJ Series, Руководство по эксплуатации

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Data Section 3-3
64
3-3-2 Configurable data
The amount of configurable data that is exchanged between the PLC CPU and
the CJ1W-MCH72 each PLC cycle is 8 blocks from the PLC CPU to the
CJ1W-MCH72 and 8 blocks vice versa. Thus, 16 blocks of data are
exchanged in one PLC cycle. A block is a continuous memory area or array
area. The total size of all 16 blocks must be less than or equal to 2000 words.
The configurable data can be exchanged between the VR, IN, OP, AIN, AOUT
and Axis Status memory areas of the CJ1W-MCH72 and the CIO, DM and EM
memory areas of the PLC CPU.
Because the PLC CPU and the CJ1W-MCH72 use different numeric formats,
the data that is exchanged must be cast. The table below lists the casting of
numeric data per memory area.
/i
Digital and analogue inputs and outputs may not be physically present, which
makes them virtual and as such they can still be used in cyclic data exchange.
3-3-2-1 Axis Status array
The Axis Status array is a special array that exists of 4 fields. The table below
lists the Axis Status fields and the corresponding PLC data type.
/i
n +12 0..13 Process Error flags for processes 1..14
14,15 Always 0
n+13 0..7 Configurable data block transfer error
Each bit corresponds to a block transferred from PLC CPU to CJW-
MCH72. A bit being on indicates a transfer error. See 3-3-2.
8..15 Configurable data block transfer error
Each bit corresponds to a block transferred from CJW-MCH72 to
PLC CPU. A bit being on indicates a transfer error. See 3-3-2.
Word Bit Description
PLC data format CJ1W-MCH72
Memory area Data format
32-bit IEEE float VR floating point
16-bit word VR floating point
IN bit array
OP bit array
AIN floating point
AOUT floating point
Axis Status field Description PLC data type
Status BASIC command AXISSTATUS 16-bit word
Position Measured position in encoder units (if
devided by UNITS axis parameter gives
MPOS axis parameter)
32-bit integer
Monitor BASIC command DRIVE_MONITOR 16-bit word
Drive status Status of the drive 16-bit word