Features:
- 20 m local-bus interface: Connects the N8-H module to the documented CS275 local-bus arrangement.
- Master/reserve operation: Supports the two-CPU AS 235 H architecture with one active bus master.
- Hardware addressing: Uses bus and participant settings that must agree across both CPU paths.
The N8-H interface is an 8-bit local-bus module with a participant-address range of 1 to 63.
A mastership change re-parameterizes the local-bus interface, so both CPU-side modules and settings must remain available.
Service planning therefore treats the CPU pair, both N8-H modules, and the local-bus distribution path as one communication chain.
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Siemens 6DS1220-8AA TELEPERM M N8-H Local-Bus Interface Module Manuals,Datasheets,Link
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- Local-bus connection: Links the AS 235 H to the 20 m CS275 local bus.
- Active master: Only the interface associated with the master CPU communicates on the bus.
- Distribution unit: The module works through the documented local-bus distribution path.
- System exchange: The CS275 path supports communication with connected automation and operator systems.
- Participant range: Valid participant addresses are 1 through 63.
- Zero restriction: Bus address 0 and participant address 0 must not be used together.
- CPU agreement: CPU I and CPU II require identical bus and participant settings.
- Replacement continuity: The incoming N8-H module should retain the approved bus and participant address plan.
- Module pair: Two local-bus modules are used in the redundant AS 235 H arrangement.
- Mastership change: The standby side can assume communication after the CPU role changes.
- Re-parameterization: The interface is re-parameterized when mastership changes.
- Fault isolation: Both CPU paths and the distribution route form one communication chain.
- AS 235 H communication: Provides the N8-H connection between the controller and CS275 local bus.
- Master/reserve systems: Supports the documented 1oo2 CPU architecture.
- Legacy cabinet maintenance: Maintains an established N8-H position and address plan.
- N-AS migration baseline: Provides the installed configuration record for an engineered successor review.