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S7-300 CPU 31x -- Product information -- Background and system information

	What are the differences between OPEN MODBUS / TCP Redundant V1 and OPEN MODBUS / TCP Redundant V2?
	What is the difference between "normal routing" and data record routing?
	Which SIMATIC S7-300/S7-400 modules support the NTP time-of-day message and how do you activate this kind of time synchronization?
	Which manufacturer ID, in other words OUI (Organizationally Unique Identifier), does SIEMENS AG use for the MAC addresses of network-compatible devices?
	What should you watch out for when using the alarm numbering procedure?
	Which IO controllers and IO devices support the following functions: IRT, prioritized startup, MRP, PROFIenergy, Shared device, I device and clock-synchronized mode?
	What is the maximum number of parameters that can be assigned to an FC and FB in the S7-300 CPU?
	Which types of connection/protocols do the S7-300/400 CPUs and the CPs support by default?
	Which PROFINET nodes support automatic commissioning and the replace device without interchangeable medium function?
	Which PROFINET nodes support the extended PN diagnostics and what do you have to configure?
	Why is only a warm start available for S7-300?
	Which SIMATIC S7 modules support the "Direct Data Exchange" function (internode communication)?
	Which entries deal with consistent data in conjunction with distributed I/O?
	What properties, advantages and special features does the S7 Basis Communication offer?
	What properties, advantages and special features does the global data communication offer?
	What is the connection between subnet masks and IP addresses with regard to subnetting and supernetting (Classless Inter Domain Routing CIDR)?
	What are the requirements for using the S7 routing function and which modules can you implement?
	How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices?
	Retentivity behavior of S7-300 CPU 31x and complete devices C7-6xx with MMC
	Status of the run-time meter after overall reset
	Why does the retentivity behavior of the S7-300 CPUs and C7 devices without MMC (Micro Memory Card) influence the contents of the variables?
	Local data addressing with S7-300 / S7 400
	S7 300 run-time meter doesn't give any value

STEP 7 -- Creating S7 programs -- Calling blocks and functions

	What are the block protection facilities available in STEP 7 to protect the the know-how of your blocks?
	What is the maximum number of parameters that can be assigned to an FC and FB in the S7-300 CPU?
	How can you install block protection for self-created blocks?
	Tips and tricks for calling and parameterizing SFBs, SFCs and IEC standard functions
	How do you transfer string variables from a data block to a function blocks, for example?
	Information about "Calling blocks and functions"
	How do you parameterize a structured data type in the IN_OUT area of an FB and a function call with an ARRAY variable?
	How do you create and update multiple instances?
	How do you update invalid block calls (time stamp conflicts) in calling blocks?
	How do you perform a block-consistency check following changes in the STEP 7 program?
	How do you determine the block number of the "Data Types for Parameters" in the program and how can you pass this parameter on to an FC?
	What is the difference between the CALL statement and the UC or CC call statement?
	What is the difference between an instance data block and a global data block and how does a CALL call influence the DB register?

What is the maximum number of parameters that can be assigned to an FC and FB in the S7-300 CPU?

Part number:

Description
The maximum number of parameters for a function (FC) in an S7-300 CPU is limited to 127. These can be IN, OUT or IN_OUT parameters. On the other hand, the number of parameters for a function block (FB) in an S7-300 CPU is not limited to a specific number, but is restricted by the maximum size of the instance data block.

Entry ID:43265135

Date:2010-06-22

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