Timers (T)
Characteristics Size
The user program loads timer cells with a time value
between 10 ms and 9990 s and by means of a start
operation, decrements the timer from this value at the
preselected intervals until it reaches the value zero.
256 timer
cells
Counters (C)
Characteristics Size
The user program loads counter cells with a start value
(max. 999) and then increments or decrements them.
256
counters
Data words in the current data
block
Characteristics Size
A data block contains constants and/or variables in the
byte, word or double word format. With STEP 5
operations, you can always access the "current" data
block (refer to Section 2.4.2).
The following data types can be accessed:
- single bits,
- bytes,
- words,
- double words.
256
words
1)
1)
In data blocks with a length greater than 256 words, you can only access data
words with the numbers > 255 with operations for absolute memory access
(refer to Chapter 9).
Which Operands are available to the User Program?
CPU 948 Programming Guide
C79000-G8576-C848-04
1 - 13
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