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Chapter 4

Block Reference

4-4

©

 National Instruments Corporation

The LOG block contains a log of error conditions and events detected by 
the device as it operates.

The STAT block contains a set of parameters that can be used to examine 
how the device is performing. It contains statistics describing the 
performance of local function blocks and the network interface.

The FP-3000 supports a wide variety of I/O channels, each with different 
types of configuration information. For example, a thermocouple channel 
includes parameters for thermocouple type and has ranges for different 
temperatures; a current loop channel includes parameters for filter 
frequency and has a different group of available ranges to chose from. 
Because of these differences in parameters, the FP-3000 has a block 
specific to each type of channel it supports. To use a thermocouple 
connected to an I/O channel on an FP-TC-120 module, the FP-3000 
provides a FP-TC-120 AI Block. This block is a standard Analog Input 
block augmented with parameters specific to the thermocouple channel on 
the FP-TC-120.

Binary Open/Close 
(

BINARY_OP/BINARY_CL

)

BINARY_OP

 only functions when 

ENABLE_OP

 has a value of 

Discrete_State_1

. 

BINARY_CL

 only functions when 

ENABLE_CL

 

has a value of 

Discrete_State_1

. If both 

BINARY_OP

 and 

BINARY_CL

 are set and enabled, neither one takes effect.

Operator Command 
(

OP_CMD_CXO

)

OP_CMD_CXO

 is a contained bit string parameter that has a bit for 

Open and a bit for Close. Open only functions when 

ENABLE_OP

 has 

a value of 

Discrete_State_1

. Close only functions when 

ENABLE_CL

 has a value of 

Discrete_State_1

. If both Open and 

Close are set and enabled, neither one takes effect.

Table 4-1.  CDO Block Interlock Priorities (Continued)