ICP DAS USA 8KE8 - Manual (Page 84)

The differences between I-8000 and I-87K series I/O modules are
Item i-8000 series i-87K series
Microprocessor No Yes (8051)
Communication interface Parallel bus (Note1) Serial bus (Note2)
Communication speed Fast Slow
DI latched function No Yes
Counter input (for digital input module) No Yes (100 Hz)
Power on value Yes (Note3) Yes
Safe value Yes (Note3) Yes
Host watchdog Yes Yes
Module watchdog No Yes
Programmable slew-rate for AO module No Yes
Note:
1. The 8000 series and 87K I/O modules can both be connected into the same i-8000
MCU, for there are two types of buses on i-8000 series main-board. Through the
parallel bus, the CPU can communicate with I/O modules very fast. For digital I/O
modules, the communication time takes less than 0.012 ms. For analog I/O modules, it
depends on the modules. For example, I-8017H’s scan rate is 50K samples per
second and I-8024’s throughput is 2100 samples per second.
2. Through the serial bus (RS-485), the communication speed is 115200 bps Maximum.
The communication time depends on the command and response length (bytes).
Normally, for digital I/O modules, one module takes less then 1 ms; for analog I/O
modules, one sample takes less than 2 ms.
3. The hardware design of the I-8000 series I/O modules doesn’t have the power on
value and safe value. Running the DCON firmware on the I-8000 MCU, they can have
the functions.
8430/8830/8KE4/8KE8 User’s manual, Jan 2005, Version 1.0, 8MS-002-10 ----- 84