Description

Mitsubishi PLC FX1N-24MR-ES-UL

*1 FX1N series PLC cannot connect together with an FX2N-32ASI-M and FX2N-16CCL-M. An FX2N-32ASI-M module cannot be attached to an FX1N series PLC that is using an FX2N-16CCL-M module. Only one FX2N-32ASI-M module can be connected to the PLC.

*2 maximum number of I/O points per system Connection is allowed as far as the following condition is satisfied: (Actual number of I/O points of PLC) + (Number of points occupied by special extension blocks) + (Number of points occupied by FX2N-16CCL-M: 8) + (32 x Number of remote I/ O modules) ≤ 128 Moreover, if connecting two or more FX2N-16CCL-M, the first master module can connect to the “remote I/O modules” and “remote device modules” but subsequent modules only connect to “remote device modules”.

*3For details, refer to FX2N-64CL-M User’s Manual. pdf

*4 The value depends on the switch setting (16, 32, 48, 64, 96 or 128 points).

*5FX2N-32ASI-M must be supplied 70mA (at typical 30.5V) from the AS-interface power supply.

*6 The I/O control points of both the FX2N-32ASI-M and PLC CPU must not exceed 128 points. Therefore, there is a limitation in the number of units (number of slaves) which can be controlled according to the I/O points recognized by the PLC’s CPU (occupation). Occupation I/O points: Each AS- I slave station occupies 4 CPU I/ O points.

• If a DC-powered main unit is used with a power supply of less than 24VDC -15% (20.4V DC or less), then it cannot be fully expanded by using special function blocks or powered extension units. It can accommodate a maximum of an additional 32 I/O points.
• If an FX1N expansion board is being used, it does not alter the rules of expansion outlined above, as it utilizes special M coils for its operation and therefore does not contribute to the maximum 128 I/O point count. Only one special function board can be used at any time. See section 3.8 for more details.

Back up Data

1.5.1 EEPROM backup

Data includes the Program, Comment, File Registers (D1000 ~ D7999), and parameter data. This will be stored as long as the EEPROM is not damaged. Mitsubishi Electric has guaranteed a life cycle time of 10,000 writes to the EEPROM memory. Users may experience operational writes to the EEPROM in excess of 10,000; however, due to temperature effects a quantitative estimation cannot be given.

When saving the device status in the EEPROM, the electric power of the PLC’s built-in capacitor is used.

If the PLC has been powered on for five minutes or more, the following device data will be saved in the EEPROM at power-down:

S0 ~ S127, M384 ~ M511, C16 ~ C31, C235 ~ C255, and D128 ~ D255.

When the EEPROM keeps the device status cannot be correctly saved to the EEPROM by shortage of electric charge, at the next power-on the status of the device will be that which was saved to the EEPROM at the last save.

1.5.2 Capacitor backup

The capacitor backed memory includes M512 ~ M1535, S128 ~ S999, T246 ~ T255, C32 ~ C199, C220 ~ C234, D256 ~ D7999 and the RTC.

The capacitor-backed memory will retain data for a maximum of 10 days (Ambient temperature: 25 °C), and requires 30 minutes to recharge upon power up.

Note: The FX1N does not have battery backup, if a system requires a backup of more than 10 days (Ambient temperature: 25 °C), a peripheral backup power source must be provided.

Initialize Latched (Keep) Devices

• When using non-latched devices

To use the latched devices as the non-latched devices, reset the latched devices by an initial pulse (M8002) in program.

• When using capacitor latched (keep) devices

If the voltage of a capacitor drops, the capacitor keep device status may be stored

incorrectly. Therefore, when using the PLC after it has been powered off for more than 10

days (Ambient temperature: 25 °C), re-set up the required devices and the current time after initializing capacitor latched (keep) devices before selecting RUN.

Initialization method

Latched (keep) devices can be initialized in the PLC memory by using peripheral equipment, and the special auxiliary relay M8032, or executing the ZRST instruction. The two major methods are described below.

• Latch memory all clear by special auxiliary relay (M8032)

When M8032 is turned ON, all latched (keep) devices (including reset coils of timers and counters) are cleared. M8032 can be turned ON and OFF using the forced ON/OFF operation from peripheral equipment or within the sequence program. Note that latched devices cannot be turned ON while M8032 is ON. When turning ON M8032 within the sequence program, note that latched devices are cleared during END processing after M8032 is turned ON.

Program example: This program clears all latched devices.