Yaskawa MEMOCON GL120 - Manual (Page 192)

System Components: Functions and Specifications
4.4.6 MEMOBUS Modules (RS-422)
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When a status error has occurred, the READY, ERR1, and ERR2 indicators will operate as
shown in the following table:
Type of Error READY ERR1 ERR2 Remarks
ROM error Flashes Not lit Not lit Checked all the time.
RAM error Not lit Flashes Not lit Checked when power is turned ON.
Common memory error Flashes Flashes Not lit Checked when power is turned ON.
Watchdog timer error Not lit Flashes Flashes Checked all the time.
2. Function
1) The MEMOBUS Module (RS-422) is equipped with two MEMOBUS ports for RS-422
communications.
2) The MEMOBUS Module (RS-422) performs communications using RS-422 (master
communications or slave communications) through the MEMOBUS ports. The MEMO-
BUS protocol or any other protocol can be used for the communications protocol.
3) The features of the MEMOBUS Module (RS-422) are as follows:
a) The transmission distance can be extended up to 500 m without a modem.
b) Communications in 1:n format are possible without a modem: 1 master and up to 31
slaves.
4) The MEMOBUS Module (RS-422) can use either 2-line or 4-line communications.
Note The maximum transmission distance and the number of slaves for 1:n communications vary
according to the specifications of connected communications devices.
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