Siemens 7MB1420, Instruction Manual, Page: 24 / 74

(6) Function table for the most important functions
(7) Switchover from measurement to calibration mode and simultaneous signalling of these
statuses via a contact
(8) Operator prompting: the corresponding LED flashes here if further inputs are required
for the entered functions
(9) Every input must be terminated by the “ENTER” key apart from the code number
(10) Flame monitor: The LED lights up when the flame is burning and goes out when the
flame is off.
(11) LED “Autoranging” lights up when the corresponding function (20) is active.
(12) Dot key with the following meaning:
– Decimal point
– Change of sign when entering values
– Start point of code entries
8.2 Input Example
You wish to switch over the measuring range
Every input - apart from the codes - must be terminated by “ENTER”.
Press the CL key in the event of a faulty input.
The analyzer is in measurement mode. This means:
The green LED lights up for “MEAS” next to “MEAS/CAL”.
Input: .111 (see next paragraph)
Since the desired function is in function group 1, it is not necessary to enter any further codes.
Input: press the MEAS/CAL key
The green LED lights up next to “CAL”.
The calibration status is thus signalled via pins 24/25 on plug X1.
Input: 1
The 1 appears in the small display and thus confirms the input.
Input: ENTER
The measured value disappears in the large display, and a line appears on the right.
The green LED lights up in field 6 in front of “Switch over measuring range”.
The green LED simultaneously flashes in front of “Range No.” in field 8 and thus requests the
input of the new range number.
Input: 3
Measuring range 3 is selected. The input is output in the large display.
Input: ENTER
The measured value appears in the large display.
The LED “3” lights up in field 1 and indicates that range 3 is active.
Input: press the MEAS/CAL key
The green LED lights up next to “MEAS”.
If a control panel is present, the status “Measure” is signalled to it.
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