◇：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
☆：Blank ─ Standard；–C ─ add in RTC
The unmarked frequencies of Digital Input (DI) or Digital Output (DO) are low speed.

B1z-10M◇△– ◎☆

6 points 24VDC digital input (4 points 50KHz, 2 points total 5KHz)
4 points relay output or transistor output (2 points 50KHz)
built-in 1 communication port
both sides are not expandable

B1z-14M◇△– ◎☆

8 points 24VDC digital input (4 points 50KHz, 4 points total 5KHz)
6 points relay output or transistor output (2 points 50KHz)
built-in 1 communication port
both sides are not expandable

B1z-20M◇△– ◎☆

12 points 24VDC digital input (6 points 50KHz, 6 points total 5KHz)
8 points relay output or transistor output (4 points 50KHz)
built-in 1 communication port
both sides are not expandable

B1z-24M◇△– ◎☆

14 points 24VDC digital input (8 points 50KHz, 6 points total 5KHz)
10 points relay output or transistor output (4 points 50KHz)
built-in 1 communication port
both sides are not expandable

B1z-32M◇△– ◎☆

20 points 24VDC digital input (8 points 50KHz, 8 points total 5KHz, 4 points low speed)
12 points relay output or transistor output (6 points 50KHz)
built-in 1 communication port
both sides are not expandable

B1z-40M◇△– ◎☆

24 points 24VDC digital input (8 points 50KHz, 8 points total 5KHz, 8 points low speed)
16 points relay output or transistor output (6 points 50KHz)
built-in 1 communication port
both sides are not expandable