PLC-5/250: logical addresses
Use a logical address to access a bit, element, sub-element, data block, file, or I/O image bit. The format of a logical address corresponds directly to the location in data storage. For example: 1N23:0.
To specify a logical address:
- Specify the module number, data section, and data file number (0-9999). If you do not specify a module number, PLC-5/250 A.I. Series assumes you mean the current logic processor. Valid module numbers depend on the module type.Module type:Valid module numbers:RM0RS1-4LP1-4
The following table lists the valid data section specifiers.
Section type: | Description: | Module: |
|---|---|---|
AS | adapter status | (RS module) |
B | binary | (RM and LP modules) |
BR | block transfer read control block* | (RS module) |
BTD | block transfer data* | (RS module) |
BW | block transfer write control block* | (RS module) |
C | counter | (RM and LP modules) |
F | floating point | (RM and LP modules) |
I | input image | (RS module) |
IS | internal storage | (RS module) |
L | long integer | (RM and LP modules) |
MSG | message control block | (RM and LP modules) |
N | integer | (RM and LP modules) |
O | output image | (RS module) |
PD | PID control | (RM and LP modules) |
R | control | (RM and LP modules) |
S | status | (RM and LP modules) |
SD | shared data | (only with a CVIM) |
ST | string | (RM and LP modules) |
T | timer | (RM and LP modules) |
* Only include the RS module number when addressing
BR
, BTD
, and BW
data types at the bit level. You do not need an RS number when using these types in a block-transfer instruction.- Include a colon (:) followed by the element number. You can substitute a semi-colon (;) for the colon. The software will replace the semi-colon after you enter the address.
- If you want to specify a bit number, include a front slash (/) or a period (.) followed by the bit number.
- If you do not specify a bit, you can specify a range of bits (00-17) within braces ({ }). Separate the start bit and end bit with two periods (..).
- If you want to address a member, such as a done bit or an accumulated value, include a period (.) followed by the member's mnemonic.
- If you want to address a sub-member (bit within a member), include a left bracket ([), followed by the sub-member (bit number) you want, then a right bracket (]). If the address does not have a pre-defined mnemonic, include a period (.), followed by DATA, a left bracket ([), the word you want, and a right bracket (]). This applies only to MSG, PD, and SBT data types.
The following table shows examples of addressing different data structures.
To specify the address of a: | Use these parameters: | Where: | Is the: |
|---|---|---|---|
Element | 1N9:22 | 1 | RM module number (1-4 for LP module) |
N | Section ID | ||
9 | File number | ||
: | Element delimiter | ||
22 | Element number | ||
File | 2F8: | 2 | Module number |
F | Section ID | ||
8 | File number | ||
Bit within a binary file | 4B3/245 | / | Bit delimiter |
245 | Bit number | ||
Bit range within a file | 413:19{07..00) | 07..00 | Bit range |
Bit within a control file | 1R6:7.DN | . | Member delimiter |
DN | Bit mnemonic | ||
Member in a counter file | 0C0:15.ACC | . | Member delimiter |
ACC | Member specifier | ||
Word in a member (without a mnemonic) in a message file | 0MSG0:0.DATA[10] | . | Member delimiter |
DATA | Member specifier | ||
[ | Left word delimiter | ||
10 | Word of member | ||
] | Right word delimiter |
Use the slash (
/
) delimiter only for addressing bit numbers. Do not use it to address data bits by mnemonic. Never use the slash for a division symbol. The division symbol is the pipe or vertical bar character (|).The following table explains the proceeding examples shown.
Address: | Type of Address: | Explanation: |
|---|---|---|
1N9:22 | Element | LP module 1, integer file 9, element 22 |
2F8: | File | LP module 2, floating-point file 8 |
4B3/245 | Bit | LP module 4, binary file 3, bit 245 |
4B3:19{07..00} | Bit Range | LP module 4, binary file 3, element 19, bits 00-07; another possible format is B3/315 |
1R6:7.DN | Bit Member | LP module 1, control file 6, element 7, done bit |
0C0:15.ACC | Member | RM module, counter file 0, element 15, accumulated value |
0MSG0:0.DATA[10] | Word in a Member | RM module, message file 0, element 0, member DATA, word 10 |
Provide Feedback