DB MA-0185-100(B)

Configured for connecting drop and trunk coaxial cables in the Modicon Quantum S908 RIO network, the Schneider DB MA-0185-100(B) (DB MA-0185-100(B) Tap Connector) provides direct physical connection and electrical isolation between network segments. It uses a 75 ohm coaxial interface with an F-type threaded male connector and operates across 100 kHz to 30 MHz.

Hardware Specifications

Parameter	Specification
Model	DB MA-0185-100(B)
Brand	Schneider Electric
Product Type	S908 RIO Network Tap Connector
Platform Compatibility	Modicon Quantum
Network	S908 RIO
Function	Drop-to-trunk cable connection
Connection Type	F-type line tap
Connector Type	Threaded male coaxial connector
Impedance	75 ohm
Frequency Range	100 kHz to 30 MHz
Tap Loss	14 dB +/- 0.5 dB
Trunk Insertion Loss	Max. 0.8 dB
Electrical Isolation	Drop isolated from trunk
Dimensions	100 x 134 x 64 mm
Weight	0.12 kg
Operating Temp	0 deg C to 60 deg C
IP Rating	IP20
Mounting	Panel or DIN rail
Material	Industrial-grade components
Certifications	CE, RoHS

S908 RIO Coaxial Network Interface

The DB MA-0185-100(B) is a passive communication-line tap for the 75 ohm S908 RIO coaxial network. Its specified 100 kHz to 30 MHz operating range defines the applicable signal bandwidth. The 14 dB +/- 0.5 dB tap loss and maximum 0.8 dB trunk insertion loss characterize the signal attenuation introduced by the tap connection.

The drop and trunk paths are electrically isolated according to the supplied specifications. Correct coaxial termination, connector engagement, cable routing, and impedance matching are required to maintain the specified network characteristics.

Frequently Asked Questions

Q: What network impedance does the DB MA-0185-100(B) use?
A: The tap is specified for a 75 ohm coaxial network interface.

Q: What is the specified signal loss at the tap?
A: Tap loss is specified as 14 dB +/- 0.5 dB, while trunk insertion loss is limited to a maximum of 0.8 dB.

Q: Does the DB MA-0185-100(B) require a power supply?
A: No separate power consumption is specified because the unit is described as a passive communication-line tap accessory.

Field Installation Guidelines

• Install the tap on a mechanically stable panel or DIN rail location within the stated 0 deg C to 60 deg C operating range.
• Verify that the connected S908 RIO coaxial cables are compatible with the specified 75 ohm network impedance.
• Inspect the threaded coaxial connector before installation and ensure that the connection is mechanically secure.
• Keep communication cables separated from high-current power conductors and high-noise switching circuits where practical.
• Avoid excessive cable bending, tensile loading, or mechanical stress at the tap connector.
• Maintain cable shielding and grounding practices specified for the Quantum S908 RIO network installation.
• Verify trunk and drop connections before network commissioning and check for abnormal signal attenuation if communication faults occur.
• The supplied data lists IP20 protection; install the component inside an enclosure appropriate for the actual field environment.

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