◇：R ─ Relay output；T ─ Transistor SINK(NPN) output; J ─ Transistor SOURCE (PNP) output
Δ：2 ─ built-in RS232 port；U ─ built-in USB port (non-standard)
◎：AC ─ 100~240VAC power supply; D12 ─ 12VDC power supply; D24 ─ 24VDC power supply
–C：Blank ─ Standard；–C ─ add in RTC
The unmarked frequencies of Digital Input (DI) or Digital Output (DO) are low speed.

FBs-10MC◇Δ–◎

6 points 24VDC digital input (2 points high speed 200KHz, 2 points medium speed 20KHz, 2 points medium speed total 5KHz)
4 points relay or transistor output (2 points high speed 200KHz, 2 points medium speed 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC; I/O is not expandable

FBs-14MC◇Δ–◎

8 points 24VDC digital input (2 points high speed 200KHz, 2 points medium speed 20KHz, 4 points medium speed total 5KHz)
6 points relay or transistor output (2 points high speed 200KHz, 4 points medium speed 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
I/O is not expandable

FBs-20MC◇Δ–◎

12 points 24VDC digital input (4 points high speed 200KHz, 2 points medium speed 20KHz, 6 points medium speed total 5KHz)
8 points relay or transistor output (4 points high speed 200KHz, 4 points medium speed 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
detachable terminal block

FBs-24MC◇Δ–◎

14 points 24VDC digital input (4 points high speed 200KHz, 4 points medium speed 20KHz, 6 points medium speed total 5KHz)
10 points relay or transistor output (4 points high speed 200KHz, 4 points medium sped 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
detachable terminal block

FBs-32MC◇Δ–◎

20 points 24VDC digital input (6 points high speed 200KHz, 2 points medium speed 20KHz, 8 points medium speed total 5KHz)
12 points relay or transistor output (6 points high speed 200KHz, 2 points medium speed 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
detachable terminal block

FBs-40MC◇Δ–◎

24 points 24VDC digital input (6 points high speed 200KHz, 2 points medium speed 20KHz, 8 points medium speed total 5KHz)
16 points relay or transistor output (6 points high speed 200KHz, 2 points medium speed 20KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
detachable terminal block

FBs-60MC◇Δ–◎

36 points 24VDC digital input (8 points high speed 200KHz, 8 points medium speed total 5KHz)
24 points relay or transistor output (8 points high speed 200KHz)
1 RS232 or USB port (expandable up to 5)
built-in RTC
detachable terminal block