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The following terms are used when the SIL2 Process CPU or the Safety CPU is used.
Term Description
Pair version Version information that determines combination of the SIL2 Process CPU and SIL2 function module, and the
Safety CPU and safety function module
Safety communications Communication service that processes the send/receive of network layers for the safety defined in the safety
predefined protocol
Safety control Machine control by safety programs and safety data communications. When an error occurs, the machine in
operation is securely stopped.
Safety cycle processing A safety cycle processing is a execution processing for safety programs and safety input/output.
Safety cycle time A interrupt time for executing a safety I/O and safety program
Safety device A device that can be used in safety programs
Safety program A program for performing safety control
Safety programmable controller A generic term for the MELSEC iQ-R series modules that perform safety control (such as the Safety CPU, safety
function module, CC-Link IE Field Network remote I/O module (with safety functions))
Standard communications Communications other than safety communications, such as cyclic transmission and transient transmission of
CC-Link IE Field Network
Standard control Machine control by standard programs and standard data communications. Modules other than the safety
programmable controller hold only standard control. (This term is used to distinguish from safety control.)
Standard CPU A generic term for MELSEC iQ-R series CPU modules that perform standard control. (This term is used to
distinguish from CPU modules that perform safety control.)
Standard device A device (X, Y, M, D, or others) in a CPU module. (Safety devices are excluded.) This device can be used only in
standard programs. (This term is used to distinguish from a safety device.)
Standard program A program that performs sequence control. (Safety programs are excluded.) (This term is used to distinguish
from a safety program.)
Standard programmable controller A generic term for MELSEC iQ-R series modules that perform standard control (This term is used to distinguish a
programmable controller from a safety programmable controller.)
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