Connection
Connecting RFID read/write devices
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07.00 | 2022/09 | 28
Connecting read/write heads for HF bus mode in Ex areas
NOTE
Information on the maximum cable lengths in Ex areas is provided in the data sheets
of the connected read/write heads.
The following devices are required for bus mode in hazardous areas:
n TN-R42TC-EX/C53 read/write head (ID 100020167)
n TN-R42TC-EX/C65 read/write head (ID 100028462) with integrated bus terminating resistor
n …/S2500 RFID extension cables
n Operation in Zone 2/22:
– VT2-FKM5-FKM5-FSM5 (ID 6930573) junction box for connecting several read/write
heads to an RFID port
– SC-M12/3GD safety clip (ID 6900390)
– Optional: VB2-FKM5-FSM5.205-FSM5.305/S2550 junction box (ID 6936821) for feeding
in an additional power supply
n Operation in Zone 1/21:
– Ex-e terminal boxes
DANGER
Potentially explosive atmosphere
Risk of explosion due to spark ignition
Operation in Zone 2/22:
Only connect the read/write heads if there is no potentially explosive atmo-
sphere present or if the device is in a de-energized state.
Protect the M12 male connector against accidental removal during operation
using safety clip SC-M12/3GD.
Protect the M12 male connector against mechanical damage.
DANGER
Potentially explosive atmosphere
Risk of explosion due to spark ignition
When used in Zone 1/21, observe the instructions for use for the connected
devices.
Operation in Zone 2/22: Connect the read/write heads via VT2-FKM5-FKM5-FSM5 junc-
tion boxes as shown in the figure below (for max. tightening torque see the data sheet of
the cable used). The maximum length of the spur line is 2m.
Operation in Zone 1/21: Connect the read/write heads via terminal boxes as shown in the
figure below. The maximum length of the spur line is 2m.
Make allowance for the power supply, particularly at switch-on (see data sheet), as well as
the maximum current carrying capacity of the lines (4A).
Make allowance for the voltage drop on the line. When used in Zone 2/22, provide an ad-
ditional power supply between the read/write heads using junction box VB2-FKM5-
FSM5.205-FSM5.305/S2550 if necessary. Up to 20 read/write heads can be connected
without an additional power supply.
Use the TN-R42TC-EX/C65 read/write head with an integrated bus terminating resistor as
the last device. Do not connect a separate bus terminating resistor.
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