System Composition
‑43‑
Table 3–6 STO terminal descriptions
No.
Terminal
Symbol
Terminal Name Performance Requirements
1
STO1
STO channel 1 Internal connection: By default,
STO1 and STO2 are connected to
+24V by using a jumper upon factory
delivery. External connection: STO1,
STO2, and +24V can be connected to
an external 24 V power supply. See
the STO function for the detailed
wiring.
2
STO2
STO channel 2
3
+24V
STO1 and STO2 power
supply+
4
COM
STO1 and STO2 power
supply ground
Table 3–7 DIP switch descriptions
DIP Switch Status
Function
S1 S2 S3
OFF OFF OFF
Voltage mode with the range of 0 VDC to 10
VDC for AI2
ON OFF OFF
Temperature mode for AI2
Set the temperature sensor type through
F9‑75.
0: No temperature sensor (AI used for
analog input)
1: PT100, ‑25°C to +200°C
2: PT1000, ‑25°C to +200°C
3: KTY84‑130, ‑40°C to +260°C
4: PTC130, ‑20°C to +180°C
OFF ON OFF
Current mode for AI2; current range: 0 mA
to 20 mA; input impedance: 500 Ω
OFF ON ON
Current mode for AI2; current range: 0 mA
to 40 mA; input impedance: 250 Ω
Note
● [Note 1] If the ambient temperature exceeds 23℃, the output current must be
derated by 1.8 mA for every additional 1℃. The maximum output current is 170
mA at 40℃. When OP and 24V are shorted, the maximum output current is
calculated by the following formula: 170 mA minus current over the DI.
● [Note 2] Based on the maximum output voltage of the signal source, select 500 Ω
or 250 Ω impedance. For example, if 500 Ω is selected, the maximum output
voltage cannot be lower than 10 V so that AI2 can measure 20 mA current.
● S1, S2, and S3 are combined DIP switches for the AI. S4 is the DIP switch for the
AO.
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