4 OVERVIEW
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■R60AD8-G set to SIL2 mode
A/D conversion is performed in both the R60AD8-G (Main) and R60AD8-G (Sub), and the values from the A/D conversion are
mutually referenced by the R60AD8-G (Main) and R60AD8-G (Sub). This dual A/D conversion ensures safe A/D conversion.
Set the model names as shown in the following table on the module configuration diagram of GX Works3 so that the R60AD8-
G module near the remote head module is Main and the other is Sub.
■R60DA8-G
As the process of the A/D conversion circuit diagnostic function, the R60DA8-G outputs voltage or current for internal
diagnostics of the A/D conversion circuit of the R60AD8-G.
In this manual, the R60DA8-G in the module set is referred to as the R60DA8-G for diagnostics.
For details on the A/D conversion circuit diagnostic function, refer to the following.
Page 286 A/D conversion circuit diagnostic function
■RY40PT5B
Relay is used to switch the analog input source to the R60AD8-G.
• Analog input from the external device
• Analog input from the R60DA8-G for diagnostics
A/D conversion circuit diagnostics is executed by switching to the analog input from the R60DA8-G for diagnostics.
SIL2 diagnostic FB library
To use the R60AD8-G in SIL2 mode, the SIL2 diagnostic FB library is required.
The SIL2 diagnostic FB library consists of SIL2 safety program FB running on the safety program and SIL2 standard program
FB running on the standard program.
The SIL2 diagnostic FB library obtained the safety approval and allows building safety application compliant with the
IEC61508: 2010 SIL2 and IEC61511: 2015 SIL2.
For details on the SIL2 diagnostic FB library, refer to the following.
MELSEC iQ-R Channel Isolated Analog-Digital Converter Module SIL2 Diagnostic Function Block Library Reference
Module Model name in GX Works3
R60AD8-G (Main) R60AD8-G(S2M)
R60AD8-G (Sub) R60AD8-G(S2S)
FB type FB name Description
SIL2 safety program FB
(Safety program)
M+SIL2ADG_ADConv_R Double input discrepancy detection and A/D conversion circuit diagnostics are conducted
for two R60AD8-G modules.
SIL2 standard program FB
(Standard program)
M+SIL2ADG-IEF_WriteDAVal_R Digital value is set to the R60DA8-G for diagnostics. Also, relay switching is conducted
using the RY40PT5B.
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