Fema B Series, User Manual, Page: 11 / 36

FEMA ELECTRÓNICA . SERIES B . Models Bxx-RTU
11
Functions included Section
Local or remote
alarms
yes, configurable 1.21.8
Address configurable 1.21.3
Watchdog yes, configurable 1.21.4
Watchdog error yes, configurable 1.21.4
Registers 16 or 32 bits 1.21.5
Remote alarms by ‘coil’ or ‘register’ 1.21.6
Local alarms
simple or double setpoint
activation delays
deactivation delays
hysteresis
inverted relays
locked alarms
1.21.8
Fast access menu yes, configurable 1.21.11
‘Bus activity’ yes 1.21.12
‘On Power Up’ yes
1.21.13
‘Setpoint on bus’ yes 1.21.14
‘Decimal point’ yes 1.21.15
Key ‘LE’ yes 1.21.20
Password configuration locked 1.21.21
Brightness configurable, 5 levels 1.21.24
Table 11 - Functions included
1.14 Functions included
Error messages related to the local instrument are shown on
display, in flash mode
(see Table 12)
. Examples given are for
instrument with 6 digit formats. Error messages related to
the protocol are sent as response frames through the com -
munications bus
(see Table 13)
.
1.15 Messages and errors
Messages and errors on display
‘Err.1’
incorrect password.
‘Err.2’
at ‘ oPt.X ’ menu entry. Installed module is not
recognized.
‘Err.W’
‘Watchdog’ error
‘999999’
+ flashing mode. Reading is in overrange.
‘-199999’
+ flashing mode. Reading is in underrange.
Table 12 - Messages and error codes for local instrument
Messages and errors on the Modbus RTU protocol
1
‘Illegal function’. Function requested is not avail -
able.
2
‘Illegal data’. Register or coil requested is not
available.
Table 13 - Messages and error codes for the Modbus RTU protocol
1.16 Start up sequence
The instrument follows the sequence indicated below at
start-up after a power loss :
1. alarm status according to configuration
(see section
1.21.13)
2. start up delay according to configuration
(see section
1.21.13)
3. all registers and coils initialized to value ‘0’
3.1 display set to ‘0’
4. detection of the active working mode ‘Full slave’ or ‘Pro -
cess slave’
(see section 1.21.2)
4.1 in ‘Full slave’ mode the alarm status is set as explained
in ‘1.’ and alarm registers are set to ‘0’
4.2 in ‘Process slave’ mode alarm configuration (setpoint,
etc) is compared with display value (‘0’) and each alarm
activates or deactivates according to the result of the
comparison
5. waits for data reception through the communications
bus