Current Loop Expansion Kit - OP-SB85C

OP-SB85C Current Loop Expansion Kit

Outline

This expansion kit supports current loop communications.
The kit incorporates a communications circuit with photo-coupler insulation and constant-current power supply of insulated type, thus realizing not only monitoring but also easy communications testing with passive or active current loop devices.

Circuit block diagram of Input/Output

Setting of Dip Switch

[ Connection for Monioring ]

Set ON the dip switch No.1 and 3 of the adapter to make the motion type "Active."

Switch No.		OFF	ON
1^*1	SD side	Passive	Active
2^*2	SD side	20mA supply	40mA supply
3^*1	RD side	Passive	Active
4^*2	RD side	20mA supply	40mA supply

*1) Set OFF for monitoring.
*2) The value of current loop is avaiable, only when “Active” is selected.

[ Connection for Simulation (active type) ]

Set ON the dip switch No.1 and 3 of the adapter to make the motion type "Active."

[ Connection for Simulation (passive type motion) ]

Set OFF the dip switch No.1 and 3 of the adapter to make the motion type "Passive."

Specification

Measurement Interface	Current loop communications (4-pole terminal block)
Measurement signal	SD, RD
Baud rate	19.2 Kbps max. (*1)
Communications test function	Monitor/Simulation
Monitor current level	10 to 60mA
Simulation mode	Passive type test, active type test, active current of 20 mA/40mA (selectable with DIP switch)
Analog waveform analysis	The signal voltages of 2 channels are measured and displayed in analog waveform Sampling: 1 MHz to 40MHz (in 6 steps) Measurement range: ±6 V/±12 V
Composition	Dedicated expansion board, relay cable, 3-wire probe cable, current loop adapter (OP-1C) (*2)

*1: The baud rate is restricted by the cable length and current value.
*2: The OP-1C Current Loop Adapter is sold separately as well.
The OP-SB85 or OP-SB85IR can be combined with the OP-1C to make an equivalent set.