Eaton easyE4 - Page 550

6. Function blocks
6.1 Manufacturer function blocks
Other
Signal diagram
QN
EC
E1
RY
BY
t ≦ t response max t > t response max
t ≦ t response max
T_
EN
QV
A B C
Fig. 251: Signal diagram of frequency counter
EN: Activates the function block
T_: Trigger input; the function code is sent to the Modbus RTU slave when there is a rising edge at T_.
BY: Busy; indicates waiting for the slave response and switches to a state of 0 when time t
response
elapses.
RY: Ready; the request has been sent and the Modbus RTU master has received a response. RY=0 if
EN=0
E1: Error; slave rejection or formal error
QV: Actual number of elements
QN: Only for FC23: Actual number of elements in 2nd request
EC: Errorcode value
A: Normal operation; the slave responds within specified time t
response
B: Fault scenario; the slave does not respond within the specified time t
response
, potentially because the
cable has been disconnected.
C: Fault scenario; the slave is sending an exception code, or wrong port selected, etc.
Retention
The function block does not recognize retentive data.
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