Technical data

6.31.4

OB 242: Deleting a

Shift Register

Function

With this function, you can delete a shift register in the data block

RAM. The entry in the DB 0 address list is cleared and the shift

still occupy memory space after they have been deleted).

Parameters

ACCU-1-L

Number of the shift register to be deleted,

possible values: 192 to 255

Result

After you call OB 242, the shift register is deleted and can no longer

be used; if you want to work with it again, it must be reinitialized.

Possible errors

•• illegal shift register number in ACCU 1

•• shift register not initialized

In the event of an error, the CPU recognizes a runtime error and calls

OB 31. What happens then depends on how you programmed OB 31

(see Section 5.6.2). If OB 31 is not loaded, the CPU goes to the stop

mode.

In both cases, error IDs are entered in ACCU-1-L that describe the

error in greater detail.

OB 240 to 242: Special Functions for Shift Registers

CPU 928B Programming Guide

C79000-B8576-C898-01

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