Section 4: Field Connections
InSpec Remote I/O HUB (ATEX, IECEx)
16
SIGNALS
Safety Extra Low Voltage (SELV) Circuits
Connect only SELV circuits to the RIO-DIO, RIO-PUL, RIO-ANI or RIO-ANO modules.
RELAY CIRCUITS (OUTPUTS)
The Remote I/O Hub requires different relay modules to switch AC and DC loads. Please
check carefully that the load voltage matches the relay type fitted.
Crydom # CN024D24 = 24V DC Load Voltage @ 1 Amp Max.
Crydom # CN240A24 = 100-240V AC Load Voltage (50/60Hz) @ 1 Amp Max.
Relay Output / Load
Relay Output / Load
Model
RL1 RL2 RL3 RL4
Model RL1
RL2
RL3
RL4
# ##
0
# ### ##
AC
AC
AC
AC
# ##
8
## ####
DC
AC
AC
AC
# ##
1
# ### ##
AC
AC
AC DC
# ##
9
## ####
DC
AC
AC DC
# ##
2
# ### ##
AC
AC DC AC
# ##
A
## ####
DC
AC DC AC
# ##
3
# ### ##
AC
AC DC DC
# ##
B
## ####
DC
AC DC DC
# ##
4
# ### ##
AC DC AC
AC
# ##
C
## ####
DC DC AC
AC
# ##
5
# ### ##
AC DC AC DC
# ##
D
## ####
DC DC AC DC
# ##
6
# ### ##
AC DC DC AC
# ##
E
## ####
DC DC DC AC
# ##
7
# ### ##
AC DC DC DC
# ##
F
## ####
DC DC DC DC
# ##
X
## ####
No relays fitted
Terminals 11 (13+) and 14 on each relay (RL1, RL2, RL3 & RL4) provide connections to the relays outputs,
controlled via the first RIO-DIO module, as follows:
Terminal
Duty
AC
DC
11 (13+)
+
14
-
The relay outputs can switch circuits designated as Installation Category III. Each relay output may switch a
maximum of 250VAC rms or 30VDC and is rated for 1 Amp resistive or inductive load at 60°C (140°F). All wiring
connected to any relay output must have a suitably sized protection device fitted to protect the relay circuit and
load being switched by it.
11
14
Fuse
1, 2, 3 or 4
AC LOAD
F2
AC Relay
Output
11
14
Fuse
5, 6, 7 or 8
DC LOAD
F3
DC Relay
Output
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