VisualHMI LUA alarm centralized management: batch triggering of warning_set and parsing by 8 slaves

Alarm centralized management:warning_set(warning_id, value, count)Batch trigger alarms +on_parse_warningCustom alarm text. Typical scenario: HMI reads the fault bits of the slaves from Modbus and maps them bit by bit into alarms - 8 slaves, each with 96 alarms, all triggered by one command.

1. API overview

2. 8 slaves × 96 alarm cases

Architecture: 8 slaves, each reading 6 consecutive registers (16bit×6=96 bit alarms) starting from Modbus 4x1000. In on_init, create_resp_que, and in on_cmd_resp, call warning_set bit by bit for each slave and each register.

_warningTb = {}   -- 0x1000~0x1005 各 bit 的告警名

function on_init()
  set_auto_read(0)
  create_resp_que()
  -- 告警设置里预配 768 条（8 台 × 96）
end

function on_cmd_resp(slave, vtype, addr, count, ret, wr)
  if ret == 0 and wr == 0 then
    -- slave 从机，addr 起始，读回 count 个寄存器
    for i = 0, 5 do
      local val = get_uint16(vtype, addr + i)
      for j = 0, 15 do
        local bitv = (val >> j) & 0x01
        local wid = (addr - 0x1000) * 16 + j + slave * 100
        warning_set(wid, bitv, 1)     -- 单 bit 触发
      end
    end
  end
end

function on_parse_warning(id, text, screen_id, control_id, p0, p1, p2, p3)
  local slave_no = math.floor(id / 96) + 1   -- 从机号
  local msg_id = id % 96                      -- 消息 ID
  local name = _warningTb[0x1000 + math.floor(msg_id / 16)] or "未知告警"
  local msg = "从机"..slave_no.." : "..name
  return msg, 1      -- 1=UTF-8
end

Alarm ID encoding convention: slave number × 100 + bit sequence number, reversed during parsing. Alarm settings need to be preconfigured for all 768 entries, with the text dynamically generated using on_parse_warning (prefixed by the slave number), which is much more convenient than statically configuring 768 texts.

Compiled from Guangzhou Dacai Technology VisualHMI development documentation (hmi-doc.gz-dc.com) LUA tutorial "Centralized Alarm Management", copyright belongs to Dacai Technology.