IDEC MicroSmart AS-i - Manual (Page 7)

1: AS-I NTERFACE
1-2 M ICRO S MART AS-I NTERFACE M ASTER M ODULE U SER ’ S M ANUAL
AS-Interface System Requirements
Master
The AS-Interface master controls and monitors the status of slave devices connected to the AS-Interface bus.
Normally, the AS-Interface master is connected to a PLC (sometimes called ‘host’) or a gateway. For example, the Micro-
Smar t AS-Interface master module is connected to the MicroSmart CPU module.
Slaves
Various types of slave devices can be connected to the AS-Interface bus, including sensors, actuators, and remote I/O
devices. Analog slaves can also be connected to process analog data.
Slaves are available in standard slaves and A/B slaves. Standard slaves have an address of 1 trough 31 in the standard
address range. A/B slaves have an address of 1A through 31A in the standard address range or 1B through 31B in the
expanded address range. Among the A/B slaves, slaves with an address of 1A through 31A are called A slaves, and slaves
with an address of 1B through 31B are called B slaves.
AS-Interface Power Supply
The AS-Interface bus uses a dedicated 30V DC power supply (AS-Interface power
supply), which is indicated with the AS-Interface mark. General-purpose power sup-
ply units cannot be used for the AS-Interface bus.
Cables
The AS-Interface bus uses only one cable to transmit signals and power. Use one of the following cable types (the wire
does not have to be stranded).
• Standard yellow unshielded AS-Interface cable (with polarity)
• Ordinary two-wire flat cable
AS-Inter face Master Module
FC4A-AS62M MicroSmar t
Slim Type CPU Module
FC4A-D20RK1
FC4A-D20RS1
FC4A-D40K3
FC4A-D40S3
AS-Interface Marks
Caution
• Use a VLSV (very low safety voltage) to power the AS-Interface bus.
The normal output voltage of the AS-Interface power supply is 30V DC.
AS-Interface Cable Two-wire Flat Cable