Siemens TELEPERM M 6DS1222-8BA N-AT Local-Bus Interface Module

Overview

19:05:33Siemens · TELEPERM M / OS 525

6DS1222-8BA N-AT Local-Bus Interface Module

Siemens 6DS1222-8BA is the N-AT local-bus interface used to connect an OS 525 operator station to the redundant, isolated 20 m local bus of the TELEPERM M CS 275 system.

At a Glance

Brand	Siemens
Model	6DS1222-8BA
Product Type	Operator-station local-bus interface module
Core Function	Connects an OS 525 station to the CS 275 20 m local bus
Application or Compatible Series	TELEPERM M OS 525 and CS 275 local-bus systems

Host Interface

Confirm the OS 525 computer and its short-AT slot arrangement.

Bus Segment

Preserve the redundant 20 m local-bus cabling and station topology.

Signal Integrity

Check grounding, isolation and permitted device count before startup.

Product Overview

Siemens 6DS1222-8BA is the N-AT local-bus interface used to connect an OS 525 operator station to the redundant, isolated 20 m local bus of the TELEPERM M CS 275 system.

Provides the operator station with a hardware interface to the CS 275 local bus. Supports input and output paths with wired-OR, asymmetric and isolated signaling. Uses the documented local-bus data rate, parity protection and half-duplex operation.

Ordering focus: confirm the N-AT short-AT board, OS 525 host, redundant 20 m local-bus topology, device count and 5 V supply.

Key Functions

OS 525 Local-Bus Access

Provides the operator station with a hardware interface to the CS 275 local bus.

Redundant Bus Signaling

Supports input and output paths with wired-OR, asymmetric and isolated signaling.

Deterministic Legacy Communication

Uses the documented local-bus data rate, parity protection and half-duplex operation.

Official Specifications

Interface Designation	N-AT module
Host Expansion Format	Short AT
Local-Bus Length	20 m
Bus Arrangement	Redundant input/output with wired-OR coupling
Electrical Isolation	Isolated local-bus interface
High Input Level	At least 2.0 V
Low Input Level	No more than 0.8 V
High Output Level	At least 2.7 V
Low Output Level	No more than 0.7 V
Self-Contained Bus Data Rate	40 kbit/s
Remote Interface Data Rate	250 kbit/s through the inductive converter
Maximum Local-Bus Devices	9
Permitted Ground Difference	Up to 2 V
Data Integrity	Block parity with distance 4
Transmission Mode	Half duplex
Supply Voltage	5 V DC

Official source:Siemens official technical data for 6DS1222-8BA.

Frequently Asked Questions

Which operator station uses 6DS1222-8BA?

The interface is intended for the documented TELEPERM M OS 525 hardware arrangement.

What bus does 6DS1222-8BA connect to?

It connects the operator station to the redundant CS 275 20 m local bus.

How many devices may share the local bus with 6DS1222-8BA?

The documented 20 m local-bus segment permits up to nine devices.

What data rate does 6DS1222-8BA use on the direct local bus?

The self-contained local-bus interface operates at 40 kbit/s.

Does 6DS1222-8BA provide electrical isolation?

The N-AT interface provides isolated signaling for the local-bus path.

What should I record before replacing 6DS1222-8BA?

Record the short-AT slot, bus connectors, redundant path and station addressing.

What must I check after installing 6DS1222-8BA?

Verify bus levels, parity diagnostics, device count and communication with the OS 525 station.

Compatibility & Ordering Notes

Before ordering 6DS1222-8BA: confirm the N-AT short-AT board, OS 525 host, redundant 20 m local-bus topology, device count and 5 V supply.

Compatibility Checklist

• Use only with the documented OS 525 and CS 275 local-bus architecture.
• Keep the local-bus device count and ground-potential difference within the specified limits.
• Restore both redundant bus paths and verify half-duplex communication after replacement.

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