Siemens CS 275 manual Interface module for 20-m local bus N-BK

This catalog is out of date, see note on page 2

Interface module for 20-m local bus (N-BK)

Description and ordering data

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

2LED F (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. 4/2 Interface module for 20-m local bus (N-BK), 8 bit

Application

The interface module N-BK is used in the remote bus/remote bus coupler.

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.

The slot for the module in the subrack for the bus coupler is preset.

Mode of operation

Operational signals and fault signals

LED W (yellow)

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

LED D (green)

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

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

-- 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 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 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
Power supply	DC 5 V
Current consumption	1.4 A
Interfaces	Central unit bus, 8 bit
- Base plug
- Front plug	Redundant 20-m local bus output,
	open collector, asymmetric,
	for connection of a cable connector
	with metal front plug
	and contact points
Weight	Approx. 0.4 kg
Ordering data
		Order No.
Interface module for 20-m local bus (N-BK)		6DS1 223-8AB
for bus coupler, 8 bit
Instructions
Interface module for 20-m local bus		Order No.
German		C79000-B8000-C406
English		C79000-B8076-C406
French		C79000-B8077-C406
Spanish		C79000-B8078-C406

Siemens PLT 130 . 1994 4/3