PRODUCT

OP-SB85C Current Loop Expansion Kit

Outline

Outline
This expansion kit supports current loop communications.
The kit incorporates a communications circuit with photo-coupler isolation 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 20mA supply 40mA supply
3*1 RD side Passive Active
4*2 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.