Siemens CS 275 manual Interface module for 20-m local bus N16-M, 16 bit

This catalog is out of date, see note on page 2

Interface module for 20-m local bus (N16-M), 16 bit

Description and ordering data

1LED F (red), signals faults (line protocol faulty, receiver memory overflow)

2 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

3 DIP switch for setting the bus address and for selection of redundant/ non-redundant remote bus

4 DIP switch for setting the participant address

5 Front plug for 20-m local bus

Fig. 4/3 Interface module for 20-m local bus (N16-M), 16 bit

Application

To connect the OS 265-3 operation and monitoring system and SICOMP M minicomputers to the CS 275 bus system. The SICOMP M minicomputer must be equipped with the KSN-16M coupling software to adapt bus communication. Local bus cou- pling (< 20 m) with other participants is only possible if these have the same earth potential. Both coupling participants must have the same earthing concept (e. g. OS 265-3 and AS 235/K/H systems). The remote bus connection unit (cf. page 4/11 must be used in all other cases and provides electrical isolation together with the bus converters UI (page 4/9).

The module handles the following duties connected with data transmission:

Collection of parameters and processing of input/output in- structions on the I/O interface channel of the SICOMP M mini- computer

Signalling of operating statuses and faults with defined dis- plays.

Design

Plug-in module, triple height, with 1 base plug and 1 front plug. Front panel width 15.24 mm = 1 standard slot.

Defined slot EA 01 in the SICOMP M minicomputer.

The interface processor of the modules is an SAB 80186 chip with a 32-kbyte program memory (EPROM) and 8-kbyte data memory (RAM).

via the serial bus. A message can be sent to a single bus par- ticipant, to several participants or to all participants.

Apart from certain cyclic messages, the receiver acknowledges every message received.

The transmitter is immediately informed when a message has been received without faults. In certain cases, the required data are also transmitted immediately with this feedback, thus enab- ling short reaction times.

The interface module N16-M stores the messages in its trans- mitter and receiver buffers until they are processed and trans- mitted and thus dynamically decouples the OS 265-3 system or the SICOMP M minicomputer from the data transfer on the bus during times of peak loading. To reduce the time required for organizational tasks, the interface module collects several mes- sages over a specific period and combines these into a pack- age. This is not the case if short reaction times are required.

In addition to the data messages, the interface module also generates and processes organizational messages together with the other interface modules on the CS 275 bus system.

These are required, for example, to transfer the master function, for routing information, redundancy tests, monitoring and signal- ling information.

Time synchronization

The interface module receives time messages and routes these on to the OS 265-3 system or SICOMP M minicomputer. In the opposite direction, it can also receive the time from the

OS 265-3 system or SICOMP M minicomputer and transmit it on the bus in order to synchronize the participants.

Diagnostic functions

The interface module detects and signals static and dynamic faults and any states which could be critical for the bus loading. It monitors the processes on the bus, on the interfaces to the user system and in the interface module itself.

During operation, cyclically triggered test programs carry out an extensive hardware test of the interface module. Faults are therefore early detected and malfunctions and cumulative faults are thus prevented. External bus diagnosis via the coupling software is also possible. The interface module provides a diag- nostic list with 23 positions which can be read for this purpose.

Technical data

Power supply	+ 5 V
	- 12 V
Current consumption	2.8 A
With + 5 V
With - 12 V	0.05 A
Interfaces	SICOMP M I/O interface channel
- Base plug
- Front plug	Redundant 20-m local bus input/output,
	open collector, asymmetric,
	for connection of a cable connector
	with metal front plug and contact points
Weight	Approx. 0.55 kg

Ordering data

	Order No.
Interface module for 20-m local bus (N16-M),	6DS1 205-8AA
16 bit

Mode of operation

Handling of messages

Depending on the type and parameterization of the communica- tion instructions, the interface module N16-M transmits and re- ceives protected messages of various lengths up to 128 byte

Instructions
Interface module for 20-m local bus (N16-M),	Order No.
German	C79000-B8000-C128
English	C79000-B8076-C128
French	C79000-B8077-C128
Spanish	C79000-B8078-C128

4/4 Siemens PLT 130 . 1994