show the entry list
FM 350-1, 350-2, 450, SM338 -- Product information -- Determining performance and quantity frameworks
 Which modules can you use when implementing software redundancy? FM350-1: changing the updating time in measuring modes
FM350-1: changing the updating time in measuring modes
Part number:

QUESTION:
How can I change the updating time in the measuring modes with an FM350-1?

Determining the updating time:

• The updating time in synchronous mode with a PROFIBUS DP cycle ( TDP) of TDP < 10ms is n*TDP. You obtain the factor n via the following formula:

n = 10ms/TDP[ms] + 1

The digits after the decimal point are dropped after division.

Example:
TDP= 6ms and n = 2  results in an updating time of 12ms.

The updating time in synchronous mode with a PROFIBUS DP cycle ( TDP) of TDP>=10ms is n*TDP  with nmin = 1.
• The updating time in synchronous mode is n*10ms  with nmin = 1.

Entering the value determined in the DB:

You must enter the factor n in the DB for FC CNT_CTL1. The address 22 is parameterized in the WORD format, address 24 has the value zero.

 Data type Data block BYTE 22 23 24 25 WORD 22 Factor n 24 ---

More information on this module is available in the manual "SIMATIC FM 350-1 Function Module", section 8.4, in Entry ID: 1086726.

 Entry ID:19953670 Date:2004-12-08