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MELSEC-Q
3 SPECIFICATIONS
3.4.16 CH maximum value/minimum value storage area (32bit) (buffer memory addresses
62 to 77: Un\G62 to Un\G77)
(1) The maximum and minimum values of digital values converted on a channel
basis are stored in 32-bit signed binary at each sampling time. (The data part is
16 bits long.)
(2) The stored values for all channels will be cleared to 0 when the operating
condition setting request (Y9) is set to ON and the setting is changed or when
the maximum value/minimum value reset request (YD) is set to ON.
(3) The maximum and minimum values of digital values converted by sampling
processing are stored even on a channel where averaging processing is
specified.
3.4.17 CH process alarm upper/lower limit value (buffer memory addresses 86 to 117:
Un\G86 to Un\G117)
(1) Set the range of the digital output value for each channel.
(2) To make the setting valid, the operating condition setting request (Y9) must be
turned ON/OFF. (Refer to Section 3.3.2.)
(3) The setting range is -65536 to 65535. (When extended mode is used, the setting
range is from -65536 to 73535.)
Make settings in four stages: process alarm upper upper limit value, upper lower
limit value, lower upper limit value and lower lower limit value.
(4) The channel, where the value outside the above setting range has been set or
the value that does not satisfy the condition of lower lower limit value
lower
upper limit value
upper lower limit value upper upper limit value has been
set, results in an error, the error code is stored into the error code (buffer
memory address 19: Un\G19), the error flag (XF) turns ON, and operation is
performed at the pre-error setting.
(5) Refer to Section 3.2.4 for details of the process alarm.
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