Interface modules for 20-m local bus N-AS, 8 bit

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Interface modules for 20-m local bus (N-AS), 8 bit

Description and ordering data

1 LED (yellow), signals ”maintenance protocol stored”

2LED (red), signals faults (line protocol faulty, receiver memory overflow)

3 LEDs (green)

D signals ”Data transfer on bus”

M signals ”Interface module has master function” T signals ”Bus processor busy”

B indicates setting of interface module on bus B A indicates setting of interface module on bus A

4 DIP switch for function and address settings

5 DIP switch for function and address settings

6 Front plug for 20-m local bus

Fig. 4/1 Interface module N-AS for 20-m local bus, 8 bit

Application

-- The bits transmitted on the 20-m local bus are returned via the receiver for checking. The fault signal occurs if the transmit- ted and received values differ (bit-by-bit comparison).

LED D (green)

The receiver control unit of the interface modules signals that data transfer elements are on the bus. The brightness of the display depends on the number of transfer elements received.

LED M (green)

Signals that the interface module has the master function.

LEDs A and B (green)

Indicate that the interface module is set on bus A or bus B. Static light signals active bus.

LED T (green)

Signals that the bus processor is busy. The central processor generates read and write signals. The display goes out if the central processor enters the STOP status.

Setting of address

In order to differentiate between the individual interface modules in the autonomous bus system, each interface module must be allocated a so-called participant address. In order to differenti- ate between several autonomous buses connected via bus cou- plers, each interface module must be allocated a bus address. These two addresses are set via DIP switches on the front panel of the interface module.

Technical data

To connect an AS 215, AS 235, AS 235 K (6DS1 223-8AC) or AS 235 H (2 x 6DS1 223-8AA) automation system to the CS 275 bus system.

The module handles all duties specifically connected with data transmission, including occasional control of data transfer.

Design

Compact subassembly, double height, with 2 base plugs and one front plug.

Front panel width 30.48 mm = 2 standard slots.

Power supply

Current consumption

Interfaces

-Base plug

-Front plug

Weight

DC 5 V

1.4 A

Central unit bus, 8 bit

Redundant 20-m local bus output, open collector, asymmetric,

for connection of a cable connector with metal front plug and contact points

Approx. 0.4 kg

The module can be selected as desired.

Mode of operation

Operational signals and fault signals

LED W (yellow)

For maintenance staff only. It signals that diagnosis informations which occured during operation are stored.

LED F (red), signals the following faults:

-- Line protocol faulty, e. g. faulty qualifier signal on the local bus, parity error in data byte, incorrect message format

-- Receiver memory overflow, e. g. if the bus processor of the interface module does not correctly read the receiver memory.

Ordering data

Order No.

Interface module for 20-m local bus (N-AS),

8 bit

¯for AS 215, AS 235 and AS 235 K

automation systems	6DS1 223-8AC

¯ for AS 235 H automation system	6DS1 223-8AA

Instructions
Interface module for 20-m local bus	Order No.
N-AS and N-BK
German	C79000-B8000-C406
English	C79000-B8076-C406
French	C79000-B8077-C406
Spanish	C79000-B8078-C406

4/2	Siemens PLT 130 . 1994