Appendix B

Addressing, Structures and Operation

Fibre Channel and SCSI systems employ different methods of addressing devices. The inclusion of a bridge or router requires that a method of translating device IDs be implemented so that each SCSI device is mapped to the appro- priate Fibre Channel LUN. The SCSI bus establishes bus connections between devices. Targets on the SCSI bus may internally address logical units. The addressing of a specific SCSI device is represented by the BUS:TARGET:LUN triplet.

When a Fibre Channel initiator initializes on an arbitrated loop, the first order of business is to determine what devices exist on the loop. Device discovery is performed, and an FCP target device list is built. Each device is queried for FCP logical units. The logical units are the actual devices that the operating system will address. When an initiator addresses a logical unit, the LUN field used is consistent in form with the SCC defined fields. All current Fibre Channel host bus adapter drivers are consistent with these methods. The addressing used is the SCC Logical Unit Addressing and Peripheral Device Addressing methods, shown in Table “SCC Addressing structure” and “Peripheral Device Addressing LUN structure”. First level addressing is supported, so only the first 2 bytes of the 8 byte FCP LUN are used.

Bit

7

6

5

 

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

n

Address Method

 

 

 

Address Method Specific

 

 

 

 

 

 

 

 

 

 

 

n+1

 

 

 

Address Method Specific

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCC Addressing structure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

7

6

5

 

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

n

0

0

 

 

 

 

 

Bus

 

 

 

 

 

 

 

 

 

 

 

 

 

n+1

 

 

 

 

 

Target/LUN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Peripheral Device Addressing LUN structure

U42093-J-Z716-1-74

Operating Manual

Page 62
Image 62
Siemens PSFR-CP41 manual Appendix B, Addressing, Structures and Operation

PSFR-CP41 specifications

The Siemens PSFR-CP41 is a sophisticated device designed for applications in industrial automation and control systems. It serves as an essential component for monitoring and managing the functionalities of programmable logic controllers (PLCs) and other automation devices. The PSFR-CP41's main features include its robust construction, versatility, and advanced communication capabilities, making it a favored choice for engineers and system integrators worldwide.

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In terms of connectivity, the PSFR-CP41 is equipped with multiple input/output (I/O) ports, which facilitates interaction with a wide range of sensors and actuators. This feature allows the device to be deployed in various scenarios, from simple monitoring tasks to intricate control mechanisms in manufacturing plants.

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In summary, the Siemens PSFR-CP41 is an advanced industrial automation component characterized by its exceptional compatibility, robust processing capabilities, and comprehensive diagnostic features. Its ability to facilitate seamless communication between various devices and systems positions it as a crucial resource for enhancing operational efficiency and productivity in various industrial settings. With a focus on reliability and user-friendliness, the PSFR-CP41 marks a significant advancement in the field of automation technology.