Fema C Series, User Manual, Page: 27 / 32

FEMA ELECTRÓNICA . Series C . C40-D
27
Protocol Modbus RTU
Bus type RS-485, configurable for 9.600 or 4800 bps
Addresses 1 to 247
Formats configurable 8n1, 8e1, 8o1, 8n2
Function code 4 read register
Registers 0 reading value (16 bits)
1 number of decimals (16 bits)
Errors 0 function not supported
1 register not accessible
Isolation 1000 Vdc
Slots allowed Opt.1
2.3 Module S1 (Modbus RTU)
The S1 module offers 1 Modbus RTU serial output, isolated, to be
installed at slot Opt1.
Configuration is done from the front keypad, through the configura
-
tion menu. The instrument must be informed that there is a Mod -
bus RTU module at slot.1 and this is done at the configuration menu
‘Tool’ \ ‘out.1’
(see section 1.29.7).
Then configure the bus param -
eters at the configuration menu ‘out.1’ \ ‘r485’
(see section 1.29.8).
The S1 module can be ordered installed in to a Series C instrument
or standalone for later installation, as it does not require soldering or
special configuration.
Terminal B B
Terminal A A
Terminal G GND
Power Signal
Installing, calibrating and configuring a M1 module
If the M1 module has been acquired installed in the instrument, then
the module has been factory calibrated. In this case you can jump
directly to point 7 below.
If the M1 module has been acquired separately and installation is
needed, follow the next steps :
1. Access the instrument and install the M1 module at slot Opt.1
(see section 1.26).
2. From the ‘Configuration menu’ go to ‘tool’ \ ‘out.1’ and select
value ‘420’ (see section 1.29.7) to inform the instrument that there
is a M1 analog output module installed.
From this point you will need the calibration sheet provided together
with the module M1. This sheet shows the values for parameters
‘cAL.y / 4mA’ and ‘cAL.y / 20mA’.
3. When selecting ‘420’ the instrument shows ‘ cAL.n ’. (‘ Do not cali-
brate ’). Press ‘UP’ (
5
) to read ‘ cAL.y ’ (‘ Calibrate ’).
4. When selecting ‘ cAL.y ’ (‘ Calibrate ’) select ‘4 mA’. Display shows
a number. Introduce the value of the ‘cAL.y / 4mA’ indicated at the
calibration sheet provided together with the M1 module. Increase
the numerical value with key ‘UP’ (
5
) and reduce the value with
key ‘LE’ (
3
). Validate the value with key ‘SQ’ (
<
). See below an
image of the configuration menu.
5. Repeat with the ‘20 mA’ parameter, and update with the value
‘cAL.y / 20mA’ indicated at the calibration sheet. Validate with key
‘SQ’ (
<
), and press key ‘LE’ (
3
) several times to exit the ‘Configu -
ration menu’.
6. The instrument will reboot when exiting the menu. The analog
output is calibrated.
Note : if you do not have the calibration sheet which was attached
to the M1 module at manufacturing time, you can use a miliamme -
ter to measure the mA at the output loop. Then access parameters
‘cAL.y / 4mA’ and ‘cAL.y / 20mA’ and adjust the calibration value by
checking the miliammeter value.
At this point the module is installed and calibrated. Now configure
the reading associated to the output signal 4 mA and 20 mA.
7. Configure the reading associated to the 4 mA output signal and
the reading associated to the 20 mA output signal, at the configu -
ration menu ‘out.1’ \ ‘420’ (see section 1.29.8).
Do not calibrate
Calibrate
Option 1
analog output
relay
Disabled Tools
Modbus RTU
B A G
Opt.1
GND
B
A