INSTALLATION INSTRUCTIONS
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7
OPT-A2
Terminal
Signal
Technical information
21
RO1/1
22
RO1/2
23
RO1/3
Relay output 1
Switching capacity
24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load
5V/10mA
24
RO2/1
25
RO2/2
26
RO2/3
Relay output 2
Switching capacity
24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load
5V/10mA
Table 7-4. Control I/O terminal signals on basic relay board OPT-A2
OPT-A3
Terminal
Signal
Technical information
21
RO1/1
22
RO1/2
23
RO1/3
Relay output 1
Switching capacity
24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load
5V/10mA
25
RO2/1
26
RO2/2
Relay output 2
Switching capacity
24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load
5V/10mA
28
TI1+
29
TI1–
Thermistor input
Table 7-5. Control I/O terminal signals on basic relay board OPT-A3
7.2.2.1
Digital input signal inversions
The active signal level depends on which potential the common inputs CMA and CMB (terminals 11 and 17)
are connected to. The alternatives are 24V or ground (0 V). See Figure 7-7.
The 24-volt control voltage and the ground for the digital inputs and the common inputs (CMA, CMB) can be
either internal or external.
Figure 7-7. Positive/Negative logic
+24V
+24V
DIN1
DIN2
DIN3
CMA
DIN1
DIN2
DIN3
CMA
nk6_16
Ground
Ground
Positive logic (+24V is the active signal) =
the input is active when the switch is closed
Negative logic (0V is the active signal) =
the input is active when the switch is closed.
Requires setting of jumper X3 to position
‘CMA/CMB isolated from ground’