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5-11

Installing Remote Base Controllers—RBCs

SIMATIC 545/555/575 System Manual

The following actions take place when an RBC is reset.

• The CPU logs the RBC off the system and zeroes the image register

points which represent the inputs from this RBC’s base. The image

communication with the CPU. If this occurs while the system is

operating, depending on your RLL program, turning these inputs off

could affect other base outputs.

• From the assertion of reset until the RBC completes the reset and

resumes communication with the CPU, the state of the outputs on this

RBC’s base is determined by the output module, with no reference to

the RBC’s JP6 (Off/Freeze) jumper. Discrete outputs go off (to a value of

zero). Analog/word outputs obey their own Zero/Hold Last Value

selection. If no Zero/Hold Last Value selection is available on the

module, the analog/word outputs hold their last value.

• If the base number you assign to the RBC (by setting the thumbwheel

or rotary switch) inadvertently duplicates the number already in use by

a second RBC on the I/O channel, then when the first RBC completes

its reset and attempts to communicate, identifying itself with the new

base number, the second RBC will be logged off the system. The state of

the second RBC’s outputs is determined by the selection made on

jumper JP6 (Off/Freeze). The CPU image register containing the input

points for the second RBC is zeroed. Intermittent operation could occur

as long as the two RBC base numbers are set to the same value.

When the CPU logs an RBC off the system, it sets a corresponding bit in one

of the status words that are available to your RLL program. Your RLL

program can use these bits to detect the loss of the RBC and control the

outputs of other bases as appropriate for your application. For details about

status words and more information about programming, refer to the

SIMATIC 545/555/575 Programming Reference User Manual.

Resetting the RBC

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Siemens SIMATIC TI500 Especificaciones Pagina 152