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

ANSWER:  

Determining the updating time:

• The updating time in synchronous mode with a PROFIBUS DP cycle ( T_DP) of T_DP < 10ms is n*T_DP. You obtain the factor n via the following formula:
  
  n = 10ms/T_DP[ms] + 1
  
  The digits after the decimal point are dropped after division.
  
  Example:
  T_DP= 6ms and n = 2  results in an updating time of 12ms.
  
  The updating time in synchronous mode with a PROFIBUS DP cycle ( T_DP) of T_DP>=10ms is n*T_DP  with n_min = 1.
• The updating time in synchronous mode is n*10ms  with n_min = 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.