MN1941WEN Input / Output 4-7
4.3 Digital I/O
The NextMove e100 provides:
20 general purpose digital inputs.
12 general purpose digital outputs.
1 general purpose relay output.
4.3.1 Digital inputs
Digital inputs are available on connectors X8, X9 and X10, as shown in section 4.1.1.
The digital inputs are arranged in three groups, each with their own common connection.
This allows each group to be configured independently for ‘active high’ or ‘active low’
operation (using the Mint INPUTMODE keyword).
The general purpose digital inputs DIN0 - DIN19 can be shared between axes, and are
programmable in Mint (using a range of keywords beginning with the letters INPUT... ) to
determine their active level and if they should be edge triggered. The state of individual
inputs can be read directly using the INX and INSTATEX keywords. See the Mint help file.
A general purpose digital input can be assigned to a special purpose function such as a limit,
stop or error input. See the keywords LIMITFORWARDINPUT, LIMITREVERSEINPUT,
STOPINPUT and ERRORINPUT in the Mint help file.
4.3.1.1 Important note regarding home switch inputs
When the NextMove e100 (the manager node) is controlling an e100 or e150 drive over EPL
(e.g. MotiFlex e100, a controlled node), the axis’ home switch input must be wired to the
drive, not the NextMove e100. This is because the NextMove e100 only triggers the homing
sequence, which is then performed entirely by the drive. It is therefore the drive which must
receive the home switch input signal, otherwise it will not be able to complete its homing
routine. Similarly, it is the drive’s own HOME... keyword parameters that define the homing
sequence.
4.3.1.2 Using a digital output to enable a remote drive
A digital output should not be wired directly to a digital input of a remote EPL drive to provide
drive enable control. Synchronisation of the digital output and EPL software enable
command cannot be guaranteed. It is recommended to use an emergency stop (E-stop)
switch with instantaneous and time delay contacts. The instantaneous contacts are wired to a
digital input on the NextMove e100. The time delay contacts are wired to the remote drive’s
enable input. When the E-stop switch is triggered, the instantaneous contacts break, allowing
the NextMove e100 to issue a software disable to stop the drive in a controlled manner. The
time delayed contacts then break and disable the drive completely.
Local drives (those that do not use EPL) are not affected, so can obtain a drive enable signal
from a digital output on the NextMove e100.
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