Communication With The Fbp; Communication With The Modbus Device; Command Interface; Table 5. Normal Leds Behaviour - ABB EP010 User's And Operator's Manual

LED Color
RX Green
FAULT Yellow
FBP Green
(1) If the FBP is disconnected, the EP010 is powered off.
After a failure has been detected and signalled, the FAULT LED continues flashing until:
1 the FBP is communicating with the EP010 (and then the EP010 is communicating with the
device using the Modbus port) and the fault is removed OR
2 the EP010 id powered off (i.e. the FBP is disconnected) or reset.
While in run state, EP010 can be in one of the following conditions:
1 FBP communicated with EP010, connected Modbus device responding (see 2.8.2.2): this
is the normal working condition
2 FBP not communicating (see 2.8.2.1)
3 FBP communicates, device not responding (see 2.9).

2.8.2.1 Communication with the FBP

Status of the communication between EP010 and FBP is indicated by FBP green LED:
flashing means communication is working, OFF means no communication.

2.8.2.2 Communication with the Modbus device

EP010 works by polling the connected device, i.e., sending Modbus telegrams (queries) to the
Modbus device and receiving responses (response telegrams) from it.
Modbus RTU query sending from EP010 to device is started when the FBP communication
between the FBP and the EP010 is started.
Modbus RTU communication between EP010 and the device (i.e. stop query sending) is stopped
when the communication between the FBP and the EP010 is stopped.
EP010 considers Modbus device to be "disconnected" when there is a checksum (CRC) error
in a response telegram, or there is no response after 4 attempts (retries) to send the same .
query. When this appens, EP010 stops asking the device for data, and it starts sending probe
queries ("Report Slave ID") to check when the device resumes communication, then starts .
polling data again.
When the communication between the EP010 and the device fails, the EP010 .
data are neither updated not reset: they are frozen until the communication has
been restored.

2.8.3 Command interface

It's possible to issue a command to the EP010 using two different interfaces:
1 cyclic, realized with an Analog Input process variable
2 acyclic, realized with a Parameter (parameter number 1)
ABB SACE
ON OFF
FBP doesn't communicate with EP010 FBP communicates AND
OR no response from PU
(if TX flashes)
FBP doesn't communicate with EP010 FBP communicates with EP010

Table 5. Normal LEDs behaviour

EP010 1SDH000510R0001
FLASHING
Modbus response from PU
receiving
See 2.9
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