Skip to content

SLC 500 and MicroLogix

The SLC driver reads and writes data file addresses over PCCC. It uses a standard Forward Open with a 500-byte connection by default.

Addresses

Address Means
N7:0 integer file 7, element 0 (also F float, L long, B bit file, S status, A ASCII, ST string)
N7:0{5} 5 elements from N7:0
N7:0/3 bit 3 of N7:0
B3/20 bit 20 of bit file 3
T4:0.ACC a timer or counter member: ACC, PRE, EN, DN, TT (timers), CU, CD, OV, UN, UA (counters)
I:0/1, O:0.1/2 input and output image bits and words 
from ciplink import SLCDriver

with SLCDriver("192.0.2.20") as plc:
    print(plc.get_processor_type())          # e.g. '1747-L552'
    print(plc.read("N7:0{5}"))               # Tag(tag='N7:0', value=[10, 20, 30, 40, 50], ...)
    plc.write(("N7:0", 25), ("F8:0", 1.5), ("B3/2", True))
    print(plc.get_file_directory())          # {'N7': {'elements': 100, 'length': 200}, ...}

use ciplink::slc::driver::SlcDriver;
use ciplink::Value;

let plc = SlcDriver::new("192.0.2.20", SlcDriver::default_options())?;
plc.open()?;
println!("{:?}", plc.get_processor_type()?);
for tag in plc.read(&["N7:0{5}", "T4:0.ACC"])? {
    println!("{} = {:?}", tag.tag, tag.value);
}
plc.write(&[("N7:0", Value::Int(25)), ("F8:0", Value::Real(1.5)), ("B3/2", Value::Bool(true))])?;

using Ciplink;

using var plc = new SlcDriver("192.0.2.20");
plc.Open();
Console.WriteLine(plc.GetProcessorType());
foreach (Tag tag in plc.Read("N7:0{5}", "T4:0.ACC"))
    Console.WriteLine($"{tag.Name} = {tag.Value}");
plc.Write(("N7:0", 25), ("F8:0", 1.5), ("B3/2", true));

#include <iostream>
#include "ciplink.hpp"

ciplink::Slc plc("192.0.2.20");
plc.open();
std::cout << ciplink::to_json(plc.get_processor_type()) << "\n";
for (const ciplink::Tag& tag : plc.read({"N7:0{5}", "T4:0.ACC"}))
    std::cout << tag.tag << " = " << ciplink::to_json(tag.value) << "\n";
plc.write({{"N7:0", 25}, {"F8:0", 1.5}, {"B3/2", true}});

#include <stdio.h>
#include "ciplink.h"

CiplinkDriver *plc = NULL;
ciplink_slc_new("192.0.2.20", NULL, &plc);
if (ciplink_open(plc) == CIPLINK_STATUS_OK) {
    const char *addresses[] = {"N7:0{5}", "T4:0.ACC"};
    char *json = NULL;
    if (ciplink_read(plc, addresses, 2, &json) == CIPLINK_STATUS_OK) {
        printf("%s\n", json);
        ciplink_string_free(json);
    }
    if (ciplink_write(plc, "[[\"N7:0\", 25], [\"F8:0\", 1.5], [\"B3/2\", true]]", &json) == CIPLINK_STATUS_OK)
        ciplink_string_free(json);
}
ciplink_driver_free(plc);

get_datalog_queue(count, queue) reads count records of a data log queue (and one more to clear it).