◇：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-10MA◇Δ–◎–C

6 points 24VDC digital input (2 points high speed 100KHz, 2 points medium speed 20KHz, 2 points medium speed total 5KHz)
4 points relay or transistor output (2 points high speed 100KHz, 2 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)
I/O is not expandable

FBs-14MA◇Δ–◎–C

8 points 24VDC digital input (2 points high speed 100KHz, 2 points medium speed 20KHz, 4 points medium speed total 5KHz)
6 points relay or transistor output (2 point high speed 100KHz, 4 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)
I/O is not expandable

FBs-20MA◇Δ–◎–C

12 points 24VDC digital input (2 points high speed 100KHz, 4 points medium speed 20KHz, 6 points medium speed total 5KHz)
8 points relay or transistor output (2 points high speed 100KHz, 6 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)

FBs-24MA◇Δ–◎–C

14 points 24VDC digital input (2 points high speed 100KHz, 6 points medium speed 20KHz, 6 points medium speed total 5KHz)
10 points relay or transistor output (2 points high speed 100KHz, 6 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)

FBs-32MA◇Δ–◎–C FBs-32MB◇Δ–◎–C

20 points 24VDC digital input (2 points high speed 100KHz, 6 points medium speed 20KHz, 8 points medium speed total 5KHz)
12 points relay or transistor output (2 points high speed 100KHz, 6 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)
(MB is detachable terminal block)

FBs-40MA◇Δ–◎–C FBs-40MB◇Δ–◎–C

24 points 24VDC digital input (2 points high speed 100KHz, 6 points medium speed 20KHz, 8 points medium speed total 5KHz)
16 points relay or transistor output (2 points high speed 100KHz, 6 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)
(MB is detachable terminal block)

FBs-60MA◇Δ–◎–C FBs-60MB◇Δ–◎–C

36 points 24VDC digital input (2 points high speed 100KHz, 6 points medium speed 20KHz, 8 points medium speed total 5KHz)
24 points relay or transistor output (2 points high speed 100KHz, 6 points medium speed 20KHz)
1 RS232 or USB port(expandable up to 3)
(MB is detachable terminal block)