20.3.1 CHANGE-ASSGN

Change of the device assignments for the following:

Current, session-specific device assignment table

Standard device assignment table for external connections (SATEC)

One of the logical devices (parameter LDEV) can be assigned to the symbolic devices (parameter SDEV). It is also possible to assign a specific logical device to several symbolic devices.

Logical Device FILE/CFILE (expandable/cyclic file on hard disk)

If the logical device FILE or CFILE is assigned, the AMO also waits for the input of a file name. The file is created by AMO if it does not yet exist. This file is always a BYTE FILE.
The file name NULL or a file name starting with NULL has a special status. It is provided for the controlled suppression of outputs, and no file is created for it. This file name is allowed only with the logical device FILE. The standard prefix of the file name for the logical device CFILE must be C- .
For the logical device CFILE, the AMO waits for the specification of the file length in addition to the file name. The file is then created with the requested length and retains this length during its life. A standard file (FILE) is set up with a length of 0 and is then continuously expanded during writing.

Assignment Test Matrix

The AMO checks the validity of the assignment on the basis of an assignment test matrix that the AMO has for each assignment table. The permitted, prohibited and permanently-assigned logical devices are entered in this matrix for all symbolic devices.
For permanent assignments, only the permanently assigned logicaldevice may be specified during the change, e.g., to reconstruct the assignment.
If the requested assignment is prohibited, the AMO enters a dialog status in which it asks the user whether the assignment test matrix is to be output.

This dialog status is initiated by an input request with the verb ’DIALOG01’. The name of the only parameter in this action, which can only be called down by the AMO, is ’ANS’, the possible values are ’Y’ or ’N’.

Example of a dialog :

Input:

CHANGE-ASSGN:SCT,DIALOG,CO1;

Output:

F03 : LOGIC DEVICE C01 MUST NOT BE ALLOCATED IN SCT
TO SYMBOLIC DEVICE DIALOG.

IS THE MATRIX TO BE OUTPUTTED WITH THE ADMISSIBLE, INADMISSIBLE AND FIXED
ASSIGNMENT SCHEMES FOR THE SCT ?

<DIALOG01-assgn:

Input:

Output:

TBL = SCT L | D
D | E
E | F C
V | A F F A U
| U C C C C C C P P P P I I A T S
| L O O O O O O R R R R L L F N E
SDEV | T 1 2 3 4 5 6 1 2 3 4 E E R D R
--------+--------------------------------
RESULT | / / / /
ERR | / / / /
DIALOG | / / / / / / / / / / / / / / / /
PR | / / / /
CON | / / / /
DPT1 | /
DPT2 | /
DPT3 | /
DPT4 | /
AFR | / / / / / / / / / / / / / = / /
ATND | / / / / / / / / / / / / / / = /

ASSIGNMENT SCHEME: INADMISSIBLE = "/" , ADMISSIBLE = " " , FIXED = "="

Procedure Overview


Command Code	Parameter
CHANGE-ASSGN	[TBL=SCT],SDEV=<param>
	,LDEV=FILE,FILE=<string>;

	\|,LDEV=CFILE,FILE=<string>,LEN=<number>;

	\|,LDEV=<remaining values>;

	\|[TBL=SATEC],SDEV=<param>
	,LDEV=FILE,FILE=<string>;

	\|,LDEV=CFILE,FILE=<string>,LEN=<number>;

	\|,LDEV=<remaining values>;

	\|[TBL=SATIC],SDEV=<param>
	,LDEV=FILE,FILE=<string>;

	\|,LDEV=CFILE,FILE=<string>,LEN=<number>;

	\|,LDEV=<remaining values>;

Example

Assign the expandable hard disk file REGEN-STAPEL to the symbolic device RESULT in the standard device assignment table for external connections.

Input:

CHANGE-ASSGN:SATEC,RESULT,FILE,"REGEN-STAPEL";

Output:

CHANGE-ASSGN:SATEC,RESULT,FILE,"REGEN-STAPEL";

H500: AMO ASSGN STARTET
AMO-ASSGN-... INPUT/OUTPUT DEVICE ASSIGNMENT
CHANGE COMPLETED;

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