Operating instructions

SIS
™
Programming and Control, cont’d
MLC 104 Plus Series • SIS Programming and Control
4-16
PRELIMINARY
Command/response table for SIS commands (continued)
Command ASCII (Telnet)
(host to MLC)
URL Encoded (Web) (host to MLC)
Response (MLC to host)
Additional description
Digital I/O data port (dedicated Digital I/O ports) configuration and use
N
An input voltage below 2.0 VDC is considered to be logic low. An input voltage above 2.8 VDC is considered to be logic high. These thresholds are not adjustable.
Set the input/output (I/O) mode
24
X22#
*
X4)
[
X22#
%2A
X4)
%5B Iom
X22#
*
X4)]
Set the input/output mode (
X4)
) for a
specific port (
X22#
).
X22#
= port number
1 = Digital I/O port 1 2 = Digital I/O port 2 3 = Digital I/O port 3
X4)
= mode
0 = input (default) 1 = output 2 = input and pull-up resistor 3 = output and pull-up resistor.
N
When set for input with pull‑up resistor (
X4)
= 2), the digital input can be triggered by an external switch. When the
switch closes, the voltage drops from 5 V to 0 V.
When set for output with pull‑up resistor, the MLC’s digital I/O port can drive devices such as relays and LEDs.
See the diagrams in chapter 2 and the special application examples in chapter 5 for more details.
View the digital I/O mode
X22#
[
X22#
%5B
X4)]
Pulse the digital I/O state
14
X22#
*3*
X6#
]
X22#
%2A3%2A
X6#
%5D Sio
X22#
*
X4# ]
Briefly change the I/O state. X6#
= Pulse time in 20 ms per unit. If this
parameter is missing or = 0, then pulse length = default (25 = 500 ms). 65535 (1310 s) = max. pulse time.
X4#
= I/O state:
0 = off 1 = on
N
This and the following three commands are valid only when the port is in output mode or in output with pull‑up mode.
Otherwise the E14 error (invalid for this configuration) is returned by the MLC.
Toggle the I/O state
14
X22#
*2]
X22#
%2A2%5D Sio
X22#
*
X4#
]
Switch the input/output state from on to off or from off to on.
Set the I/O state to on
14
X22#
*1]
X22#
%2A1%5D Sio
X22#
* 1
]
Set the I/O state to off
14
X22#
*0]
X22#
%2A0%5D Sio
X22#
* 0
]
View the I/O state
X22#
]
X22#
%5D
X4#]