28: AS-INTERFACE MASTER COMMUNICATION
28-18 « FC4A MICROSMART USER’S MANUAL »
AS-Interface Operands
This chapter describes AS-Interface operands, or internal relays M1300 through M1997 and data registers D1700 through
D1999, assigned in the CPU module to control and monitor the AS-Interface bus, and provides detailed description about
internal relays allocated to SwitchNet™ control units for use as slaves in the AS-Interface network. Also describes ASI
commands used to update AS-Interface operands in the CPU module or to control the AS-Interface master module.
AS-Interface Operand Allocation Numbers
The I/O data and parameters of slaves on the AS-Interface bus, the status of the AS-Interface bus, and various list informa-
tion of the slaves are allocated to the AS-Interface master module EEPROM. This information is called AS-Interface
objects, which can be accessed through the AS-Interface operands. The allocation is shown in the table below.
*1: The time required to update the operand data. When using the AS-Interface master module, the scan time increases by
a minimum of 10 ms.
*2: These AS-Interface operand data can be read or written using WindLDR. For details, see page 28-30.
*3: The LPS, PCD, and PP are set and downloaded to a PLC using WindLDR. For details, see page 28-32.
*4: IDI (input data image), ODI (output data image)
*5: The analog I/O data is updated only when an analog slave is connected to the AS-Interface bus.
Processing Time
AS-Interface internal relays for digital I/O and status infor-
mation, and data registers for LAS, LDS, LPF are updated
in every scan. Data registers for analog I/O operands are
also updated in every scan only when analog I/O are con-
nected to the AS-Interface bus. The processing times for
these AS-Interface operands are shown in the table above.
Other AS-Interface data registers are updated when an
ASI command is executed in the CPU module. For the
processing times of the ASI commands, see page 28-28.
MicroSmart CPU Module
Precessing
Time (msec)
*1
Read/
Write
AS-Interface Master Module EEPROM
Operand
Updated
Operand Allocation No. AS-Interface Object
AS-Interface
Internal
Relays
M1300-M1617 3.0 R
*2
Digital input (IDI)
*4
Every scan
M1620-M1937 3.0 W
*2
Digital output (ODI)
*4
M1940-M1997 1.0 R Status information
AS-Interface
Data
Registers
D1700-D1731 5.2 R Analog input
*5
D1732-D1763 5.2 W Analog output
*5
D1764-D1767 1.0 R
*2
List of active slaves (LAS)
D1768-D1771 1.0 R
*2
List of detected slaves (LDS)
D1772-D1775 1.0 R
*2
List of peripheral fault slaves (LPF)
D1776-D1779 1.0 R/W
*2*3
List of projected slaves (LPS)
Each time ASI
command is
executed
D1780-D1843 10.4 R
*2
Configuration data image (CDI)
D1844-D1907 10.4 R/W
*2*3
Permanent configuration data (PCD)
D1908-D1923 3.0 R
*2
Parameter image (PI)
D1924-D1939 3.0 R/W
*2*3
Permanent parameter (PP)
D1940 0.7 R/W Slave 0 ID1 code
D1941-D1945 — R/W For ASI command description —
D1946-D1999 — — (reser ved) —
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