Description:
In S7 communication with PUT and GET SFBs/FBs, data consistency is dependent on the individual servers (S7-400 CPU):
 

CPU	Order no.	Consistent data (bytes), max.
CPU 318-2DP	6ES7318-2AJ00-0AB0	1 Variable, max. 462 Byte
CPU 41x-1	6ES7412-1XF03-0AB0
CPU 41x-2	6ES7412-2XG00-0AB0 6ES7414-2XG03-0AB0 6ES7416-2XK02-0AB0
CPU 41x-3	6ES7414-3XJ00-0AB0 6ES7416-3XL00-0AB0
CPU 41x-4/H	6ES7417-4XL00-0AB0 6ES7414-4HJ00-0AB0 6ES7417-4HL01-0AB0

Table 1: Overview of the consistency ranges

Notes:

• CPU 318-2DP behaves like a 41x series CPU.
• The statements also apply to more recent order numbers:
  for example, for 6ES7412-2XG04-0AB0 instead of 6ES7412-2XG00-0AB0

You can find further information:

• In the STEP 7 online help, 'Common parameters of the SFBs/FBs and of the SFC/FC for S7 communication')
• In the "System software for S7-300/400 system and standard functions" manual, Entry ID 1214574:
  This contains a block-oriented overview of S7 communication and data consistency (Chap. 20). "Common parameters of the SFBs/FBs and of the SFC/FC for S7 communication" are described in Chap. 20.1.